In reply to cutting off the right hand after taking the mark of the beast in the right hand or after plucking out the right eye after taking the mark of the beast in the forehead because a person repented and decided not to worship the image of the beast and wanted to go to heaven, first of all, I don't think anyone is going to first take the mark of the beast, and then next worship his image immediately after taking the mark.  If anything, in my opinion, a person will first have to worship the image of the beast, and then next take the mark of the beast which will enable them to buy and sell.  

No one lining up to take the beast's mark will be taking a saw with them to cut off their right hand after taking the mark nor would they have an instrument with them to help them pluck out their eye after taking the mark in the forehead unless they read your post at 5doves about it called Can taking the 666 Mark of the Beast ever be forgiven? MARK 9:43-48 (fivedoves.com)

Also do you think that the Beast & False Prophet will allow people to go home and decide whether they want to worship the image of the beast the next day if they took the mark of the beast first.?  I strongly doubt it.  Or if they are at home, and someone comes around to give them the mark, do your think someone will come back the next day to see whether they have decided to worship the image of the beast via a TV screen or computer screen the next day?  I doubt that also.  If anything, everyone will be required to worship the beast's image first as a symbol of the worshipper's allegiance to the beast, and then they will take the mark of the beast in order to buy and sell.  

Most people will first see the beast and his image on a TV screen or on an computer screen. I doubt everyone in the world is going to travel to the Temple Mount in Jerusalem to worship the image of the beast and take his mark there in Jerusalem.  Places will probably be set up in local locations all over the world where people can worship the image of the beast on a TV screen or computer screen and then take his mark in order to buy or sell. 

Will there be any Christians at places where people line up to worship the image of the beast and take the mark of the beast in the right hand or in the forehead?  If there are, hopefully they would be preaching Rev. 14:9-13 which shows the harsh & eternal punishment for taking the mark of the beast and how they will be blessed if they are martyrs who don't worship the beast and his image.  Or do you think there are going to be Christians at places where people line up to take the mark of the beast who are preaching to them to be sure to cut off your right hand or pluck out your right eye if you repent and change your mind and decide not to worship the image of the beast in the next few minutes?  I'd rather see Christians preaching Rev. 14:9-13 because of what Rev. 22:18-19 says, "For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book: And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book." Verses would have to be added to Rev. 14:9-13 if a person was to believe that they could repent and cut off their right hand or pluck out their right eye after taking the mark of the beast.  Rev. 14:9-13 says, "And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand, The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb: And the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name. Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus. And I heard a voice from heaven saying unto me, Write, Blessed are the dead which die in the Lord from henceforth: Yea, saith the Spirit, that they may rest from their labours; and their works do follow them."   There are no additional verses added to that prophecy in the book of Revelation that say, If you take the mark of the beast in the right hand or in the forehead, and then repent and decide not to worship the beast, and cut off your right hand with the mark in it or cut out the section of your forehead with the mark in it, you will not be tormented with fire & brimstone in the presence of the holy angels and in presence of the Lamb.  The Bible doesn't say that.

In any case those who took the mark of the beast and who worship the beast's image don't repent.  If any did repent,  words would also have to be added to Rev. 16:2 which says, "And the first went, and poured out his vial upon the earth; and there fell a noisome and grievous sore upon the men which had the mark of the beast, and upon them which worshipped his image."  This verse doesn't say, ...and there fell a noisome and grievous sore upon the men which had the mark of the beast unless they decided not to worship his image, repented and cut off their right hand which had the mark of the beast or plucked out their right eye or cut out the section of their forehead which contained the mark of the beast. Rev. 16:9, says, "And men were scorched with great heat, and blasphemed the name of God, which hath power over these plagues: and they repented not to give him glory.  And Rev. 16:11, "And blasphemed the God of heaven because of their pains and their sores, and repented not of their deeds."  

The image of the beast could also be considered an idol. Rev. 9:20-21 says, "And the rest of the men which were not killed by these plagues yet repented not of the works of their hands, that they should not worship devils, and idols of gold, and silver, and brass, and stone, and of wood: which neither can see, nor hear, nor walk:  Neither repented they of their murders, nor of their sorceries, nor of their fornication, nor of their thefts. they of their murders, nor of their sorceries, nor of their fornication, nor of their thefts." 

Also Matthew 5:28-30 says nothing about plucking out the eye if a person who takes the mark of the beast, then repents and doesn't worship the beast's image because Jesus says, "But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart. And if thy right eye offend thee, pluck it out, and cast it from thee:for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell. And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell."  

A person definitely needs eyes to look at a woman and lust after her while a person doesn't need eyes to take the mark of the beast because a blind man could take the mark and also worship the image of the beast without seeing it.  Also a person needs at least one hand to steal or murder, but they don't need a right hand to take the mark of the beast because a person has a forehead where the mark can be placed.  And if a person took the mark of the beast, and if Matt. 5:28-30 really applied to taking the mark of the beast in the forehead, they would have to cut out the section of their forehead where the mark of the beast was placed and not pluck out their eye because the forehead where the mark would be the offensive area that contains the mark of the beast and not the eye that doesn't not contain the mark of the beast.  No one will be taking the mark of the beast in the right eyeball or in any eyeball.  Matt. 18:8-9 & Mark 9:43-48 also discuss a person's foot, hands or eye offending them, and a foot has nothing to do with taking the mark of beast because no one takes the mark of the beast in their foot.  And what if you had a man blind in both eyes whose right hand was accidentally cut off before he took the mark of the beast?  The blind man without his right hand can still worship the beast without seeing him and he doesn't need a right hand because he can take the mark of the beast in the forehead.