Hold a competition! Make them enter their own mini-hacks and whoever has the best one, should get the rights.
If I knew anything about hacking, that isn't Storyline Writing, I'd enter. I'd love to be a part of the Ruby Destiny series. It may not be as good as it would have been if you made it, but anyone who is a fan of the others will love it if it's done by someone chosen by you.
-ROBO-BOY out