Why is 12 bit important to you? 4:2:0 at 12 bit is much lower quality than RGB at 8 bit.
I suggest you simply use 8 bit RGB all the time. madVR cannot change the bit depth but if you set 23Hz as 12bit the driver will use 12 bit when madVR switches to 23Hz.
Please do some visual tests, if 12 bit looks the same as 8 bit to you please do not obsess about getting 12 bit. 12 bit really is the least important improvement and not worth sacrificing anything else for.
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