Nice try at salvaging something. You cannot say that no-one else could have done the same, after all even the Russians managed it with their copy of the French design. Also the project had a choice of two engine designs.Supercruise was archived by a very clever aerodynamic design of the engine systems and that work was done in its entirety at a Rolls Royce experimental site at Hucknall in Nottinghamshire. Without supercruise ability, Concorde wouldn’t have worked as a viable passenger carrier. By comparison the remainder of the airframe was not that difficult.
To say the rest of the airframe for supersonic flight was not that difficult is total nonsense, there were some very difficult unique problems to solve at that time.
Concorde was French and they deserve the credit for it, and for us to try to steal the credit is pathetic. The chief designer for the project was Pierre Sartre who had designed a string of successful jet aircraft. His deputy for the project was Sir Archibald Russell who never designed a jet airplane. Russell designed WW2's least remembered planes, the Beaufighter and Blenheim, then post war designed the Brabazon which was unable to even complete a successful inaugural flight. Eventually he designed the Britannia which was years behind the times at its launch.
Below is a link to the media report from the time when the French design won over the British one, which was based on the delta wing Vulcan bomber:
Air Commerce
.