This seems so obvious that I'm astonished that anyone can't see it, let alone that professional military aviators are arguing the point.
I can see that co-locating AWC and the OEUs is a good plan, but they haven't done that.
I'd think that moving the AWC to Boscombe, and the OEUs, and making Boscombe the 'T&E Hub' might be a good plan.
I'd deploy frontline squadrons there, using those HASs, much more often, though, and make sure that the TPs and OEUs visited the frontline bases more often.
Simple if you don't bother yourself with informed knowledge!