I have a Wii mini with a wasp, GC port 1, SD card slot, and wifi already set up. Was able to play GC games, and use the controller, but stock brawl didn't recognize wifi or SD.
Attempted to boot modified Wii games from WASP didn't work, and I would imagine that update checks were also probably stubbed. If you'd like to send me something to try, I can try it sometime in the future.
I'm currently of the opinion that without a new USB-based exploit, it's highly unlikely that anything like this would work. Would be nice if it was possible to extract the NAND keys, then you could just swap the chips. ヽ༼ຈل͜ຈ༽ノ