I know some of you might know it long ago , but I am glad to post it out again.
To solve IPL version distriction, you just need to use Swiss 0.3 as initial loader on Wiikey Fusion.
If you are still troubled by IPL 1.0 gamecube, do not hesitate to flash Swiss 0.3 to your Wiikey Fusion. Via Swiss 0.3, its game compatability would be the same as IPL 1.1.
Well done, emu_kidid.