I was gonna edit the original post now that OS 6 is out, but it looks like I can’t (or can’t figure out how to). Well, elementary OS 6 is out! 
I also forgot to add that to make the screen resolution options persist, you’ll need to add them somewhere that runs at login, like at the end of your ~/.profile file.
I seem to be getting some minor graphical glitches now and then, and need to determine if it’s because of the resolution or something else. But so far the physical size at (a faked) 3000×2000 is so perfect. I’d love to see a display with this native resolution for the ultimate in crispness…
