The best solution would, of course, be to run a SRAM XDR cassette but you've noted that the freehub body is difficult to find. Not best practice but I'm running a 12-speed Ultegra cassette (11/34T) on a Rival AXS drive train on one bike and it works fine. Technically the rollers are larger on AXS chains (from what I understand) and I'm not sure of the long term ramifications of running this Frankenstein setup, but from purely a "does it work" standpoint it seems to be ok...
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