I'm working on control stage commands, so eg. quality storage tanks can be back-converted before deactivating the setting and/or switching to 2.1, to prevent entity loss. So I will release my own feature backport as well, independent from your fork.
Adding a 3rd state to the "hide entities" setting to only affect mining drills (and maybe a 4th for bots/turrets?) is a good idea, but I deliberately didn't make that the default to not cause issues with upgrade planners/filtered deconstruction planners.