You would definitely need someone that knows what they're doing with graphic images. I'm crap when it comes to creating or drawing on the computer screen. Pixels and shading is not my thing, lol.
But I definitely get what you're saying. Having it automated is the big thing that you're looking for. Seeing as how you've already applied this idea with the connection between gender and avatars.
I can give it A TRY, when I have some more free time. This would definitely be time consuming. Especially for a novice like myself.