The fact nobody in here can even tell me something useful with regards to which SDK I SHOULD be using then if these supposed Wii controls can really be fixed makes me that much less motivated to really be spending a lot more time on this thing when there are much more important platforms like Android and iOS that people are using these days anyway and which require a lot of attention and work as well.
A homebrew scene is only as good as the guys at the top of the totem pole - if they can't feign to give a shit and make sure the development tools are catered to, then everything stops.
Have you had any success talking to people like Tantric or Eke Eke? I feel like they would be the ones to talk to regarding SDK stuff since they've used it successfully in their emulators.
It's a sometimes unfortunate truth that most of us here just aren't skilled enough to help you. But we want to help in whatever way we can. RetroArch is so close to being a nearly perfect, inexpensive classic console emulator (screw pixel perfect accuracy, I want a emulator that plays right and sounds right) for Wii. If there's any way us endusers can help you with the last few hurdles, please let us know.