i saw a youtube video of some people buying and playing wii vc games from different regions...
it involved changing your settings of what country you were in, then having to run an update, then play what you like
(iirc that is.... gimme a sec and i'll see if i can find it for you)
EDIT - ok, found what i was looking for, but unfortunately it sounds like it wont work for you.... something about japanese wiis not having the option to change country..
have a look anyway, sorry if its teasing