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giofox
hippy
BareNecessities
Well looky here, looks like someone has done it
https://www.youtube.com/watch?v=7kUxmkuJWNg
"The original RX812 rear shifting inner and outer plate are changed to the XT RD-M8000-SGS super long cage rear derailleur to support the front double-speed crank, and further support the rear derailleur to 11-46T. (The results will are like the attached video)"
This is cable but I guess you could do the same to Di2.