T_M
Nice one Centurion
The crux is that all personnel operating as crewmen should have the same level of training, regardless of service, especially if operating the same ac type. The desire would obviously be to have everyone receiving the most comprehensive training (the RAF and RN DHFS course would be the one to go for), but alas this costs the most money too.
Having crewmen as SNCOs is important as the rank carries more credence down the back if you've got 40+ troops on. The fact that the crewman could have the same rank as his AAC ac commander is irrelevant as everyone on board should know their place as Captain/Co-Pilot/Crewman, and it is the former with whom the buck stops and who is the final arbitrator should any differences of opinion remain.
If one argues that on 2 crewmen ac such as Me/Ch, you could have an RAF SNCO crewman and a lesser (read "less comprehensively trained" before you get on your soapboxes) trained AAC JNCO crewman, that wouldn't work either, as both crewman do subtly different roles on the aircraft (and they are all able to fill both positions). Organising the manning plots for dets and attachments etc would be made even more of a headache. And we wouldn't want to get into a "Sorry sir, I'm just ramp up/ramp down" scenario either.
Please, feel free to have AAC crewmen manning RAF aircraft, but train them the same, give them the same SNCO status (all RAF guys start as A/Sgt) and treat them the same.
SASLess
As Tiger Mate said, all nations operate differently and see their way as being as effective as they need, and others as being too complex or too simple. We say "tomartow", you say "t'mayda" (if you're from Brooklyn). And it will always be thus. Those that criticise the way you do/did it without the experience of how you do it, aren't worth listening to. A man of your experience will know that anyhoo. I have first-hand experience of watching both US Army and USN "SH" aircrews operate Black/Sea Hawks and whilst their MOs were different to ours in many ways, they were intrinsically the same in many others. The crewmen/crew chiefs perform a different role to our (air)crewmen, but the aircraft were none the less effective for it...