The opposite seems to work, 11speed thumbies with Eagle 12speed - https://bicycles.stackexchange.com/questions/44178/sram-x01-eagle-12speed-in-11speed-transmission-it-work
Microshift came back saying that 12sp shifters wouldn't work on anything but x-actuation. Rival is exact actuation so I guess back to hunting
@Dave_Whitinsky started
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The opposite seems to work, 11speed thumbies with Eagle 12speed - https://bicycles.stackexchange.com/questions/44178/sram-x01-eagle-12speed-in-11speed-transmission-it-work