How to force EDID override on Intel Mac running Sequoia

Working with a 2020 MacBook Pro 4TB on Sequoia 15.6. In the past I have edited EDID override plist files to get custom resolutions and HiDPI on external QHD displays. I have also used BetterDummy/BetterDisplay to achieve this, but that app no longer works with Intel Macs (according to the developer, at least not for getting HiDPI resolutions). In the past (not sure which macOS version it changed on) you could edit display overrides in /System/Library/Displays/Contents/Resources/Overrides. It is no longer possible to do this, even with SIP disabled as /System is now read only. A workaround was to place a custom override in the folder: /Library/Displays/Contents/Resources/Overrides However, it seems that overrides in this location are no longer read by macOS. I am trying to get HiDPI (at 1980 x 1080 or 1600 x 900) on DELL P2418D and BENQ PD2500Q QHD displays. Both have worked in this was the past, with modified EDID and/or BetterDummy/BetterDisplay. Is there any way of forcing EDID override on Intel Macs running Sequoia now?