I flew the Allison TF-41 in the SLUF, not the TF30 of the early variants, and I understand that the Brits added a "re-heat" to the sucker ( Spey) for their F-4 model. Only thing that sticks with me was how efficient that motor was.
The A-7D and A-7E used the licensed Spey - the TF-41.
I am wondering about the comment that the J-58 was already a prototype that needed to have the bypass ducts for the Blackbirds. I realize that by the time the Blackbird was in the design stage that somebody somewhere was already working on a high thrust motor. I also realize that development of a totally new motor would have been a bitch to test and employ.
Hats off to the Concorde folks that had a "super cruise" jet as early as they did. That thing not only looked good but flew good, maybe great.