Just a quickie.
Super Hornet with full internals and a centre line tank needs just under 2000 ft of roll in Max AB.
STOBAR is therefore not really a player in my mind.
We have made our bed, we are going to lie in it. If US defence cuts add a gallon or two of 'no F-35B' urine to the equation well that's our fault for a) going down the STOVL route to start with b) attempting to let the UK build its own carrier - in yet another collaborative fudge- and c) making the best decision ever to go cat and trap, followed by the worst one since we left a small island nation with no MPA. (Which is in itself the worst decision ever and will probably never be beaten - although Hitler's crack at Russia does come close)