Hold on a sec.... what about the ACF? Or the SCC? They dont have a full commission do they, yet they get the job done? Having a Royal Warrant means nothing in all honesty - as you say, its a bit of paper! Its how you work on the ground, how you interact with the regular Air Force (or Army, or Navy), and how they perceive you that matters. If you are seen to do a good and worthwhile job, then you'll get the help and respect you deserve. If you are seen to be an oxygen waster first class, throw your rank around, and wind everyone up, then you have to expect the flack and lack of co-operation that would go with it!
As for VGS instructors.... Why do you feel you need a VRT commission?? What does it honestly give you that a lord lieutenants commission wouldn't? What would you lose if you were simply a civvy? You'd still get the flying suit and shades....?