you could just install a cheap XenoGC chip on your drive and burn Swiss to a (mini) DVD, then use SD Gecko for any homebrew.
I do have a Xeno chip installed, but I can't record the miniDV media GC uses so they are bootable.Only person I know who was able to burn me bootable discs had to use an ancient external SCSI drive that supported 1x record speed.
Gamecube just sucks, I'm done with that hunk of shit soon as my GBA Consolizer arrives.
That's all I used it for was GBA, for actual GC/Wii games I use Nintendon't homebrew software on my Wii U.
Sold my component cable already for 180$.
What a terrible system, def one of Nintendo's worst IMO.