Could the Sea Vixen be used as a cut rate Phantom for those fleets which operated British built light fleet carriers? If that is possible could they become more common then they were in OTL, for example have the Australians, Brazilians, Argentinians, and Indians use the Sea Vixen as an air defense fighter. One POD i could see as a driver for this is if the USS Princeton is sunk during the Vietnam war by opposition fighters, giving nations with a small carrier a strong desire not to turn their carriers into pure attack boats.