Has anyone tried using the XX1 cassette, shifters and chain with any 10 spd derailleur?

As the shifters control the derailleur shifting distance, I can't see any issues with shifting, other than being able to reach the 42 cog.

Loosing the clutch and chain control of course, but the aim is to get the 11 spd cassette gear range with only buying the XX1 cassette, shifter and chain and any 10 spd ring of choice.