Just stumbled across the fact that I can actually choose for AutoRF or manually, Channel 165.
Not sure when this got enabled but it used to never be an option (never understood why, such a waste).
Not sure what the requirement is (hardware version or software), but it is still not an option on MR32 on 26.X
So I'm assuming it requires 27.X or newer, or WiFi-5 Wave 2 model hardware, or both.