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Daft idea? It would be Ultegra Di2 so will chainslap be an issue without the clutch mech and will the cassette size be too restrictive compared to the Sram 1X offerings?
Been tempted by something which looks like a good deal on the spec sheet but concerned it is only a good deal because there are big drawbacks to its use off road!
Fit an XT Di2 mech with clutch, and possibly an 11-40 cassette? Can set up the shifters so that both buttons on right shift up, and both on left shift down - makes panic shifts in heavy gloves much better.
I lost a chain today on my gravel bike - SRAM Force with a clutch - so I'd not want a 1x without a clutch.
Didnt realise XT would work that sounds a good option.
MTB/road Di2 mixes happily.
I run this setup with the left hand buttons for downshifts and the right hand buttons for upshifts. The Di2 shift buttons are tiny so this actually works better than the original setup, where it was very hard to hit the correct button. The new shifters are meant to be better.
I run R785 shifters and XTR Di2 mech. Went with XTR as it has the clutch, couldn't face bangbangbangbang down every trail. 40t Rotor ring with 11-32 cassette. Never had the chain come off (and that's with some fairly adventurous off-reading) and the gearing is fine round the Surrey Hills. Did Dirty Reiver on it last year too, no problems. It's a brilliant setup.
One snag is that with a smaller cassette I needed to file down the mech mount bracket a bit as otherwise the B tension was too strong and the top jockey wheel sat too far from the cassette. It would be fine with an MTB cassette though.
You can't mix road front mechs and mtb rear mechs though, so if you decide you want a front mech you'll have to change the rear mech too.