With this Full Size SD Card Adapter you can load Swiss along with ISO and Homebrew to use with the PicoBoot mod. Simply Format the SD Card in Fat32 or EXFat and put the Swiss Dol file on the root of the SD Card and any other software you plan to use and insert it into Memory Card Slot 2 so that Memory Card Slot 1 is available for standard memory cards.
This adapter will work in all Game Cube models unlike the SD2SP2 adapters but which will only work with the models with the Serial Port 2 (SP2) which were only available in the early models.
Be sure to rename the Swiss dol file to ipl.dol in order for PicoBoot to load Swiss properly. Latest Swiss releases are going to be available here on their github: