In Tim Mason's The Cold War Years; Flight Testing Boscombe Down - 1945-1975, there is a page or two dedicated to flying the prototype F-15A at Edwards by members of the FJ Test Squadron.
If we had gone down the F-15 route , there is also the issue of boom tanking.
Slightly digressing, in Bill Gunston's Tornado fact file (pub by Salmander) there were attempts to sell the GR1 to Australia, Spain and Canada but they ended up picking the F/A-18A/B. Likewise to Jordan, Oman, Qatar and even Iraq evaluated it in 1982.
cheers