blah blah blah, snip, refer to original post if you want to
The Blackburn Buccaneer sounds *practically* perfect for what you need. They were actually delivered to South Africa in '63 so the timeline is practically dead-on perfect. They carry *only* 5 tons of bombs, but that should be plenty 'nuff - if you really want the 10 tons requirement you can simply order more and really unless you're carrying a 1st gen nuke there's no real need for more. They only have two engines - but especially at this time drafting a requirement around the number of engines is beyond silly especially since your AU nation's own competitor uses bombers with just two engines (Tu-16s).
Range is a more operationally relevant requirement and the Bucc's got long legs. They have only a crew of two and I imagine are probably a little less of a beast than the -105. Also they're not supersonic but they're amongst the best performers in the transonic range of any aircraft flown. They're also specifically anti-ship planes, which is a big deal against Turkey. Plus, we know the Brits will sell them.
The F-111 is a harder sell because it's a larger, more complex and more expensive aircraft but it will certainly meet the requirements you're looking for aside from the engine stipulation. Also it probably won't be export-ready until 1970 at the earliest, but there were several export offers in real life (only Australia bit the bullet to buy them, though).
In the meantime Canberras or even Lincolns can be an interim purchase. B-47s or V-Bombers would be a bit much and B-47s and Valiants were already starting to retire by 1958. B-45s would already be in the boneyards but it's not inconceivable that they'd be used in the interim waiting for Buccs too. But your most realistic choices are the Canberra and Bucc.