So what I gather here is that essentially for Android to be possible one of two things needs to happen at minimum..
LemonLoader updates it Unity version compatibility to be at least if not past what MDRG uses.
Or
MelonLoader adds Android functionality. Which based on their wiki page they seem to have tested somewhat, but have concluded it's very limited. Though that testing might have been before updating to integration with a more recent very of Unity.
So I gather it's not strictly impossible. However there's clearly nothing you can do about the issue with the tools available.
I think my only concern about this sort of thing is that with a mod that handles such a significant function that the dev hasn't managed to address themselves, they may simply decide since the mod exists they no longer need to bother.