I repeat, the most sensible thing is to expend the RN Obs pipeline on the King Air at Culdrose. As far as I am aware the Avenger flies with a radar emulator console so it should be configurable to any rear seat simulation. As the RAF have ceased the Nav Officer pipeline the RN should provide this maritime role, after all 6 or so P8s shouldn't need a huge cadre of Officer Navs. Also I don't think it would take long for a Merlin or Lynx Obs to convert to the FW MPA role.