devkitPro

I have done some GBA dev but nothing for Wii. I want to try to port Fake-08, an open source multi platform PICO-8 emulator that I believe uses WUT for its Wii U build, to the Wii. Since Wii and Wii U are similar I feel this must be possible, but I don't know where to start with understanding the platform differences. Is anyone aware of a guide somewhere that could help me understand how to migrate in one direction or the other between Wii and Wii U?

The WiiU port uses SDL2 so there isn't really much need to worry about platform differences. You can just use the Wii SDL2 port & figuring out minor differences with buttons & paths.