Sorry, but I'm 99.9% sure you will never get the i2s connection you are hoping for. The Muse uses what Kevin Halverson calls i2s plus where every important electrical stream gets its own wire (hence the 13W3 connector). Only the Model 5 and 8 transports have the necessary i2s plus outputs. All other systems that use i2s connections are of a different configuration.
You can try contacting Kevin at Muse.
Wish I could furnish you a link to the white paper on i2s plus but I haven't been able to find it.
Read the review that Dave Duval at SoundStage wrote on the Model 2 plus. It mentions the incompatibility.