This is now possible! I bumped the other topic up as well with the link, but the developer of Lunar got it working and has offered it up in this beta build:
https://github.com/alin23/Lunar/issues/417#issuecomment-1067319528
I'm running it now and it's amazing. I don't intend on running the display full tilt at 1600 all the time, but having it (and all levels between 500 and 1600) as an option for when you need better daylight visibility or just more brightness is awesome.