Biggus, you have used two words which sum up the issue with MPA - "the capability". SDSR took a policy decision to remove the FW MPA capability. It stated that the capability could be provided by other mean, including using Allied assets.
To re-instate the FW (or quick reaction long endurance) capability a policy decision will need to be made via SDR 2015/16. There appears to be no other mechanism than this.