Sounds like branch pay should be looked at as an alternative to the "basic plus flying pay" system we have now. Flying pay is not there to make up for the hazards of the job. Its there because without it, staying past your 6 year return of service would be financialy irresponsible. You expect to pay someone with 15 years flying experience the same as an adminer just because you put them in a ground job against their will? You won't be paying them it for long I assure you.
Post SDSR the RAF does appear to have more aircrew than it knows what to do with at the moment, but the markets are picking up and 50% of pilots on my Sqn have ATPLs burning holes in their back pockets. The cost of flying pay will seem pretty insignificant when you start loosing airframes because no-one in the military has more than 1500hrs in their logbook.