The GC games don't know how to access wii motes ==> If you get GC games in wii mode, you need to patch the controller functions to accept wii mote input. I'm assuming if you get GC games in wii mode, that you have mem2 access, and at least the memory for bluetooth and wii mote drivers is not the issue.
I would go as far as even if somebody makes GC games in wii mode possible, it will still be very difficult to do this. Also if your controller doesn't work in homebrew, then it it will NEVER work for this.