Yeah... I have characters that would be traditionally defined as "evil," but not a lot of outright traditionally "good" ones. I can't necessarily say that it would be easy
to turn them traditionally "evil," however, assuming we're supposed to do it plausibly, not just "oh, I'm a jackass now, bitches."
Sounds like an alright idea to me. Can't say it appeals to me personally, but it seems like it'd be useful to identifying character motivations and the validity thereof.