Ok real world, De Havilland Australia (DHA) builds 80 Vampire fighters and fighter bombers for the RAAF followed by 110 Vampire trainers (most built in Australia, some assembled, some imported). Thin wing Vampire (Venom) proposed (even before 1st Vampire delivered) but not proceeded with, licence production of Sea Venom by DHA for RAN considered but not proceeded with (Vampire trainer contract awarded instead). Vampire fighter and fighter bomber equips regular and reserve squadrons until RAAF reserve loses flying role in 1960, trainers serve the RAAF until 1970 and the RAN FAA until 1971. Vampire, although in service with the RAAF at the time, is not deployed to Korea and the Mustangs serving with 77 squadron are replaced in theatre with Meteor F8s. In addition 78 Wing RAAF is equipped with RAF owned Vampire FB9 while garrisoning Malta from 1952 to 1954, returning to Australia prior to the creation of the Far East Strategic Reserve which was seen as a greater priority than the Mediterranean deployment.
My very simple whiff is that Australian production switched to the Venom at the earliest opportunity, licence production of the Sea Venom is undertaken in Australia for the RAN and either the Sea Venom (for commonality reasons) or the Venom NF3 is also produced to re-equip the RAAF reserve squadrons as they convert to the FAW role. If possible the Venom enters service with the RAAF before the RAF and serves in Korea instead of the Meteor F8, meaning the Meteor never enters regular squadron service with the RAAF, if not possible no problem forget it. Vampire trainer is still produced as in reality but possibly delayed with more of them being imported due to capacity and timing issues at DHA. Australian built Vampires and Venoms are supplied to RNZAF in particular but some other countries under Commonwealth defence agreements aided by some US MAP funding. 78 Wing re-equips with Venoms and stays in Malta past 1954, while 77 squadron returns to Australia post Korea and along with 3 squadron is eventually re-equipped with Sabres, P1082s, or Hunters. A third regular fighter wing is formed in 1955, equipped with Venoms and based in Butterworth Malaysia as part of the Far East Strategic Reserve.