It's not so bad.
His most FM changes applied to DYN files that will be possible to replace. Both DYN packs will be available in installer and allMods so each can be installed anytime.
Only code change is related to air density calculation, but it's more good than bad. To compensate it's side effect - wrong ceiling, INI variable "dyad" was added.
Sometimes, helicopter explode right in the air - I have found possible issue in side resistance code, so I guess it's a coincidence that it happen with his changes only. But I may be wrong.
Hovering changes does not affect normal flight modes. Only issue, happen when helicopter explode right after hovering is disabled, is fixed.
Overall - you will be able to make FM same as in 1.16.0 but with working hovering modes.