I've made a decision not to infringe on copyrighted properties owned by other people and discontinue my commercially available work that does. As for working with the permission of copyright holders -- I would consider it, but I wouldn't know where to begin.
I know this is really late, but DC practically took over Wondercon last year. A lot of them were really down to earth and helpful/supportive of fans with ideas. I plan on volunteering at Wondercon again this year, if you aren't attending or can't get a hold of them, I can *try* to get their contact info for you.