Originally Posted by bonsai171

Looks like the DI2 GRX derailleur would work too. Unfortunately the derailleurs cost a small forture. Had another idea. There is an SLX crankset with 38T/28T (SLX FC-M7000-2) which will work with a 11-42 cassette. That combo would yield ~17-18 gear inches. Is there a front derailleur, rear derailleur, and set of hydraulic STI shifters that would work this this combo? Could be a winner.

Dave