Personally I don't see why they couldn't have reversed the early-2000s abolition of the ACW/LACW/SACW ranks (which was considered an 'empowering' move at the time, but by the standards of today looks like it 'erased' women - there's a lesson there about the perils of trying to keep up with social scientific trends), allow individuals the freedom to switch between the gendered ranks as often as they like, and replace the catch-all term 'airmen' with 'airmen and airwomen'. As a bonus, the act of saying 'soldiers, sailors, airmen and airwomen' implicitly advertises the RAF's openness to both sexes. Yes, this wouldn't address non-binary or asexual people, but trying to please everyone - especially those of an activist mindset - is a very difficult thing to do.