If you have 2 drivers for the Y, the stupid easy trick might be to get another stepper motor and attach the rotary to one of the y drivers and attach the other (loose) stepper to the other drivers.
I’d disconnect at the motor ends (usually more accessable).
This way both drivers are loaded and shouldn’t know the difference and you have it working the same as everyone else.
nema23 can be had pretty cheap, or if like many of use you might have one laying around – I usually have 6 or 7 spares JIC
But then I have 3 3d printer, 2 laser engravers and a 3018 CNC
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