Was this feature removed from OSX? Or did OP try it already and it didn't help much? Honest question here; I haven't touched a mac in over a decade.
Fixed the issue for me.
I've got an LG one at home, and heading into work where I have 2 27" monitors, but only 1440p always feels like a downgrade.
I have a 4k display, and when I select the "Looks like 3840 x 2160" option, UI elements are too small. Selecting "Looks like 2560 x 1440" results in blurry fonts. So I've selected "Looks like 1920 x 1080", and thanks to Retina, fonts are crystal clear. Unfortunately, UI elements (such as the menu bar at the top of the screen) are pretty gigantic now, but I live with it.
https://github.com/LumingYin/macOSLucidaGrande
Note for me, this makes the ••• dots go away when typing passwords into system prompts. Fine!
Really skimped and got a peasant model there, eh?
(Note that this is sarcasm directed at Apple’s pricing, not at rusk, who I assume is a very decent human being.)