I just like the Fury option as local production by CAC would have been a no brainer if the decision had been made earlier, i.e. mid 50s.
Its perfectly logical as the FAA had just cut its teeth over Korea and the versatility of having a strike aircraft to supplement the FAW would have been fresh. Then again the carrier force was cut just after this experience so reality indicates that lessons weren't learned.
Then again lets say the political situation was different and defence was taken more seriously, Vengeance was retained, Sydney was modernised and a more competitive day fighter / strike fighter was required to supplement the Sea Venom. Perhaps Leviathan could have been bought and completed to a similar / superior standard as Melbourne either instead of Sydney, or in addition to, permitting one carrier in reserve, one serving as a CVS and one as a light strike carrier with Sea Venom and Fury.
Either way the RAN has a requirement for two front line and one training squadron of Furies for the late 50s early 60s. CAC steps up and develops an Avon Fury with Aden cannon and then also offers the type to the RAAF as a replacement for strike roled Sabres permitting the RAAF to reduce the size of the Mirage order (or to buy something better). So three RAN FAA sqns, and say three RAAF sqns, maybe even composite regular reserve establishments, and maybe a Lead In Fighter Trainer establishment as well.