Personally, I don't see why you can't just place GCOS as the first ISO on the disc. The Wii should boot GCOS from the disc, and you then can just select all other ISOs you have on the DVD from the menu.
Won't work, a multi-game disc starts with a header before the first ISO that the Cube/Wii won't recognize, so it won't boot.
I modified the multi-disc-maker to use GCOS instead of this header (and add the data that GCOS needs to recognize the disc as a multi-game disc) and posted that over on wiinewz, but noone reported success with it.









