Bruce, clearly you are ill informed - there is simply no way that a NCM could be a better Pilot than an Officer, the RCAF said so...
Honestly when one looks at history - it is no surprise that the "Knight's of the Sky" took to ensuring their gallant trade was not infested with peasants. However now that most of the peasants are also literate, it's hard to justify beyond "we have always done it that way" (which of course runs smack into the wall of reality when one looks at what was done when one actually needed a lot of Pilots).
I don't see the British Army doing much different here than the US Army did with the SF, graduate the Q Course and you get promoted (if you already where not a Staff Sgt)