Single player game, no impact on you. So, who cares. I wouldn't, but if someone else wants it, go for it.
doesn't mean it would be good game design
some1 allready mentioned the balance isseus
there's the skill requirement issue
and than there's the fact there has to be a bit of dedication and importance to the choices you make while building your character
if you can endlessly swap it around it wouldn't feel like a character increasingly becoming stronger
would be more like swapping parts on a car.
I say no, you svckas should just learn to live with the choices you made (see moral to it and everything XD)