Do miis import as favorites? If not, you would have to be able to edit the corrupt me to set it as such, otherwise it won't appear in NL's menus.
it should show up as if you went to play a two player game and selected a second mii. I'm gonna try to play with this tonight.
Actually your post is what gave me the idea at first! So I decided to do some research on it then try it!
that's what I thought lol, I'm glad that you ended up trying it.