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It should be possible to use a 9200 rear on an 11 cassette.
Is the spacing from 11s to 12s the same? Then you'd just wind in a limit screw I guess. But if the spacing is different, I'm not sure. I'd be questioning who has the money for DA rear deraillers but not 12s cassettes.
Some compatibility exists but mostly 12S is a new world.
https://bettershifting.com/12-speed-r9200-r8100-and-11-speed-di2-compatibility/#use11with12
hippy-
I have a couple of Shimano wheels with 11 speed cassettes.
If I buy a bike with 9200 I want to be able to use them. I am not going to buy 12 speed cassettes when I have half a dozen 11 speed cassettes in the basement.
If I break a 9200 rear derailleur I want to be able to put any di2 derailleur on as replacement. The exact replacement is not always available.
davidual
I thought you had to use an xtr derailleur to get rear only function?
I’d like to see completely interchangeable function between 9100 and 9200. It should be possible to use a 9200 rear on an 11 cassette.