Hey, would it be possible to compile one of the emulators to work with Twilight Hack or Homebrew Channel? Also, even though Nintendo tried to block the hack, a workaround is available for download.
I would attempt programming one myself, but I don’t under stand C/C++ (which ever one the .ELF files use)
It could easily use the GameCube’s two analogs to emulate the two D-pads, and there are far more than enough buttons on it.
Here’s a link to an article on installing devkitPPC (a homebrew Wii devkit) under linux. They also have a Windows installer, though. I have the GBA/DS version of devkitPro, and it works fine on Windows.