Nothing I've heard of, but I know some games like DKCR have Ocarina codes that let you use the Classic Controller. Personally I think it would be nice if we could use the GC controller with the Wii version of LoZ: TP, along with a difficulty booster, to make a TP version of Master Quest (Since the world is already flipped). I just really hate the Wii controls in TP.
But I do know it depends on if the original game has access to certain parts of the Wii's hardware. Hence why only certain games and VC could use the GC controller