Is it possible to play as a good character as well as an evil character on the SAME character? Say I was a good character and beat the game, then saved it on Save 1 but then I killed my wife cause she wouldnt bang me (this is all hypothetical)

but saved that on Save 2 would I be able to play both of them?
Also, I want to see what Jack's mask looks like if you wear it but i don't want to keep it on so is it possible to wear it without it being permanent? Like saving then wearing it?