I can't answer all your questions but CFG Loader is the one for playing Wii games from SD.Does anyone think this Kingston 512GB SD card would work?
I'm seriously considering getting one so I can have all my GameCube, Wii and Wii U backups in one place and finally get rid of that "format USB drive" nag screen all the time, just a nice tidy SD card only situation. I know USB Loader GX won't work with GC/Wii stuff, but will CFG USB Loader? Or am I stuck with Wiiflow? If only Wiiflow then does it support ISO or only WBFS?
Didn't know WiiFlow does it too.