Aha! I sympathise! Not sure who produces your plates? In the absence of an edict from 'higher command', I think what I would have done in my days as a RAF Command IRE would simply be to issue an instruction that where the plate is annotated DA/H, use it as such, and where it says MDA/H add 50'. If you have that authority, I'm sure that would keep you safe until it is all resolved - and if anyone from command 'bleats' about it say "Well, where were you when I needed you?"