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The SR-71 used a different high flashpoint fuel (JP-7) to most aircraft, which require separate tankers (KC-135Q) with segregated storage.

No. The Q's ran on JP-7. They had the turbojet engines, while most other tankers had turbofans.

The Q like most early KC-135 used used Turbojets(J57) later upgraded to Turbofans (CFM56) as the T

As far as I know only the A-12 family and the X-51 used JP-7 given it needed Triethylborane (TEB) to ignite.