Shaving without commitment

I like my own hair just fine, but I don't have a problem with the idea of parting with it should the occasion arise. But what would be the most prudent way to proceed?

[Caution to those at work: it's some dude without his clothes. But there are bubbles, so it should be copacetic, right?]

I saw a HeadBlade in the store the other day and thought to myself, "I might try that if I knew that I could change back if I didn't like the way my head looked." That's when I came up with the idea of a razor with undo.

The way it would work would be to mate an electric or non-electric razor with a can of spray-on hair in the color of your existing hair. If you make a mistake and take off more than you actually want, you would flip a switch on the thing so that you could reforest the bad spot with a bit of spray-on. To go even higher-tech, one could imagine a gadget that collects and cleans the little hairs being shaved off, so that when you hit the undo button they could be stuck back on, assuring an absolutely perfect color match to what you had before. Assuming that that was what you wanted (think bad dye jobs). It would be like having CTRL-Z for your head! (Geeks know what I mean by that.)

It would also be great for persons undergoing sudden hair loss (such as during chemotherapy), to get rid of the weak hair and replace it with something more durable.

I think it might also work in the case of shaving one's face, though am somewhat dubious about how convincing the spray-on stuff would be in emulating a beard, let alone a mustache. It might be good in combating the problem of uneven sideburns, perhaps.

I know that there are women who shave their heads also, but I think it might be a savvier marketing idea to go after the much larger segment which shave their legs. I find it unlikely that they would have much reason to restore the hair, but I understand that some people have problems with cuts during this procedure, so I think the obvious choice would be to mate a razor with antiseptic and spray-on skin. As soon as one felt or saw a little nick, a spritz of this and a spritz of that should set you right.

Also would be nice to have: software to let you know what your bald head would look like beforehand. But that would be the subject of a different post altogether.