If I had to choose one, I'd say Capcom as they would be the most amenable to it and the most beneficial to Nintendo.
Honestly though, as you said in another thread, it'd be more worthwhile investing in their own studios or new ones with all the lay-offs recently.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.