New Update, untested. Need results, see op for DL and changelog.
Support for three brawl mods at a time (if you're smart enough, you can add more yourself).
Because ProjectM uses the File Patch Code that reads from SD:/projectm you can have it there.
Brawl Minus GCT needs the modified File Patch Code to read from a different directory (remember SD:/minusery ?)
If you do decide to use Minus.gct, instead of RSBE01.gct for minus, you must change the brawlex directory as well! (hex editor is your friend)
If d-pad left == ProjectM.gct
If d-pad right == Minus.gct
Then if you do not press any button, ML will simply launch default RSBE01.gct, meaning private/wii/app/rsbe/
Don't forget to rename your GCT (Minus.gct , ProjectM.gct, RSBE01.gct)