You can change your mind and take amputation later
Ability to change your mind is a great idea..... especially if you can grow an entirely brand new body and have your mind transferred to the new body through a simple process, with your choice of keeping or changing your physical appearance, that would be ideal.
It would be even better if this mind transfer could be done almost entirely in "software", so only select physical parts of your brain actually need to move at a time, and essentially, your mind and body will be completely replaced with new cells, but you'll retain every memory and all knowledge and such you had before, even if your newly built body is 30 years younger than the one you are changing mind from.
I'm sure this will be a matter of routine within twenty years or so. You'll be able to 3D print a new body and download your mind/personality into it as easy as installing an operating system from a thumb drive.
As a bonus, our new cyborg bodies will be powered by cold fusion so we'll be able to live on Mars (or in Interstellar Space) indefinitely without needing any external life support or human contact.