At least in Big Sur, you can just place the override in /Library/Displays/Contents/Resources/Overrides instead of /System/Library/[...]. This may work in earli

At least in Big Sur, you can just place the override in /Library/Displays/Contents/Resources/Overrides instead of /System/Library/[...]. This may work in earlier versions as well, but it equally wouldn't surprise me if it was only added to Big Sur because of the Signed System Volume thing.