I was thinking of doing similar - I prefer 2x for gravel and have a hard-on for huge cassettes. Would love to find a combo or firmware hack that could allow MTB Di2 to work with GRX bits.
My Tripster has been running 46/30 with 11-42T on the back for a couple of years now I think. I've got a 46T here I was going to try it out with but it just flew to Poland today so that ain't happening.
I was thinking of doing similar - I prefer 2x for gravel and have a hard-on for huge cassettes. Would love to find a combo or firmware hack that could allow MTB Di2 to work with GRX bits.