As the OP's intent was a bit of idle fun.
The Wasp (and the Scout) - might remind the moaners how far things have come.
I am suprised no one who operated it has stood up for the Tornado GR.4 or is it too recently out of service?
Phantom FG.1 plus catapults for the QEs to make lookers' lives more fun.
Should have developed an AV8-B plus based SHar FA3
However, I would have loved to have seen one or all of the Hawker P.1121 (single and twin seat versions), P.1125 or P.1129 in service. For those that don't know the P.1121 was intended to be a Mach 2.5 replacement for the Hunter in both A2A and GA roles. The 1129 was Hawker's answer to GOR.339 that led to the TSR2. It would have been much better looking IMHO.