FYI, if anyone is interested in "hacking" their EDID but doesn't want to go to these lengths, I've had success using a combination of BetterDisplay [1] and AW EDID Editor [2]. See this discussion for some tips on how to use it [3]. Obviously with BetterDisplay this solution is specific to MacOS, but it works, and you don't have to dive into hex code.

You can use it to force RGB mode, force 4K60hz, etc.

[1] https://github.com/waydabber/BetterDisplay

[2] https://www.analogway.com/emea/products/software-tools/aw-ed...

[3] https://github.com/waydabber/BetterDisplay/discussions/1473