The “experts” in Australia ideally want the F-22.That’s both impossible & impractical in most ways.The F-15E would frankly be the best fit.
The Flanker,with any degree of upgrades will still be inferior to the F-22.The only chance it would have is at close-range,but then pilot skill would become crucial.
“The F-15E would frankly be the best fit.”
I’d actually guess that F-16’s, or perhaps a few F-15s (20/80) mixed with F-16s would be the best option.
F-16s are quite a bit less expensive than F-18s (IIRC, no carrier requirements) and are certainly battle proven. They are going to single engine with F-35...