Hmmm..... well I already dumped my wii data onto my sd card. Are you sure that it is impossible to make a wad out of it? I've seen wads for other channels, most common one being the internet channel.
EDIT: I have now found the mario kart wii channel files and have dumped them onto my computer. I also got the ticket for it. Does anyone know of a good up to date tool to use to pack this into a wad?
EDIT 2: Nevermind. I got the wad created, then I used freethewads and it works like a charm now. So basically, I can now use the PAL Mario Kart Wii Channel on my NTSC wii. If anyone wants me to release the wad, I'll be more than happy to.