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I have successfully put a GRX 46-30 chainset onto my otherwise Ultegra Di2 setup.
Interesting, as they say you'd need the GRX front mech for those with the wider chainline.
Samuli-
was hard pressed to find a difference between the mechanical R8000 & GRX front mechs.
Pulled out the vernier (with battery but sans cap of course) and measured.
The cage shape is a tad different, everything else was the same.
My conclusion? R8000 mechanical front mech can handle it all, GRX is braze on only and thus may need clamp = more cash for no reason.
Bob_Thod
Doesn’t solve the power meter issue, but I have successfully put a GRX 46-30 chainset onto my otherwise Ultegra Di2 setup.
Currently running with an 11-34 cassette but it should work with the 11-40 I had on previously.
Chain is slack in the bottom two cogs but Di2 won’t let me cross chain anyway.