If this works anything like the PS2 did with mice/keyboards/steering wheels then it all comes down to the driver missing. Its possible for a game to have a driver that would work with a standard KB without native Wii support.
The very popular PS2 steering wheel from Logitech was actually a repackaged wheel they originally released for the PC. Since the drivers were the same it was possible to buy the old PC wheel and have it work with the games.
I believe Nintendo is dragging its feet when it comes to the online ability of the Wii. At minimum Wii sports should have had some type of global scoreboard to see how you fair against others.