The A-7 is a good aircraft and I actually considered suggesting it in place of the Bucc; I think despite its single engine it can actually carry more then the Bucc and pretty much meets the warload requirement you stipulated in the OP (one of the reasons why was because it had a single BIG engine, basically the same one that was on the F-14 with the afterburner lopped off) and it's pretty versatile, being the closest thing the USN and Marines had to a dedicated close-support aircraft once the A-4 left, or even in the meantime. However you seem to be implying a long-range strike craft and the A-7 has pretty short legs. And in practice it was more restricted to tactical support as opposed to the all-around strike including ASM missions you seem to be looking for. It could carry Harpoons no doubt (it did routinely in the USN) but to carry Martel or other ASMs would probably require more work than really worth it.
The A-6 would be another choice to consider; except for having just two engines (and I already went over that point with the Bucc) it either meets or outright exceeds all of your stipulations (its warload is frequently quoted at being in excess of 16,000 lbs - rarely did Tu-16s or B-47s carry more - though on the flipside rarely did the A-6 carry that much either), has a very long range (it's likely it's got the longest range of any USN aircraft ever fielded on a carrier until the F-35s come into service) and like the Bucc also only has a crew of 2. It's got a reputation for being a maintenance hog but this reputation was earned during the era of the F-18 "electric jet" and the Bucc wouldn't be much less of a hangar queen anyway. But I feel the superior (if not vastly superior, at least in relative terms) transonic performance of the Bucc outweighs any benefits of the A-6 for your requirements. The A-6 was more of a medium-altitude all-weather bomber and I have the impression it was even expected to use its all-weather ability as partial cover against enemy defenses; when it first debuted in low-level roles in Vietnam it encounter the same problematic AA gun fire (people don't realize medium-and even light-caliber AA guns claimed more USN/USAF aircraft than any other Soviet-bloc weapon including SAMs and interceptors, perhaps combined) as all other U.S. types adapted from the role ("adapted" is the key word here as the USN didn't see low-level bombing as important until Vietnam. The USN had a different operational perspective from the RN; the USN expected its primary aviation role as being power projection, and that means interdiction of ground-based targets. At the time it was thought medium-altitude bombing was the most appropriate way to counter these targets. Ironically this mentality proved true again in Iraq, but I guess that goes to show aircraft operational flexibility is important. Really, the USN didn't put much thought into actually attacking other ships. The operational thinking at the time was to neutralize the Soviet Navy defensively by putting up an anti-missile screen, and if you had to engage enemy warships you'd just lob whatever weapon conveniently armed with a nuke on hand which usually meant either RIM-8 Talos in anti-ship mode and, yes, it had an anti-ship mode and was judged equal to a 20-inch battleship rifle on kinetics alone, or a nuke-tipped ASROC with its detonation depth set to zero. The biggest threat the Soviet Navy offered were its aircraft, its missiles which might as well be aircraft, and its missile-launching submarine force, including both cruise-missile and ballistic missile-launching boats. Even Harpoon started out as, yes, an anti-submarine weapon to counter surfaced boomers and to this day, despite having the biggest warhead in its class with a whopping 210 kilos comparable to some of the larger Soviet supersonic weapons, many people consider Harpoon's actual anti-ship performance to be inferior because it lacks an actual armor-piercing warhead. The Soviet Navy had poor power projection capability and was almost entirely geared towards defeating the USN, so neutralizing the Soviet Navy offensively wasn't deemed relevant or efficient compared to other priorities. The RN, however, still considered aircraft-launched anti-shipping attacks important even to the point of old-fashioned dumb-bomb attacks and recognized such an aircraft could carry that capability over to other missions, hence why the Bucc had such impressive transonic, low-level performance.)
I realize that's a whole wall-o-text I wrote, and most of it is only optional for your purposes, but it does lead to an understanding of why people designed things the way they did and maybe even give you more insight into what your AU navy needs as opposed to just wanting what's tacticool.
The F-111 would probably be the most perfect aircraft that was available OTL except it would still be too small to carry such a huge missile at 10 meters. Mostly though, you'd have to wait a while for it and it's not realistic to expect a nation to wait for an aircraft prior to its own operational requirement drafters being aware of its existence - barring Twilight Zone physics, of course.
And what Timothy said, the MirageIV would end up being redundant almost no matter what you settle on. The only truly impressive thing about it was its fast-while-still looks and raw Mach performance - in all other areas it was honestly a mediocre performer and the only thing that the F-111 doesn't blow it away on is the looks department and even that's debatable.
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