Still no correct answers, though not for lack of trying; so here's an early morning clue. Thanks; Ernie P.
Question: What warbird system or equipment do I describe?
Clues:
(1) Usually, systems are designed to fit existing aircraft. And, sometimes, warbirds are designed or redesigned to carry a paticularly valuable bit of hardware. This is one such case.
(2) This weapons system, for such it was, was based upon the experiences of an ally, who used similar systems quite successfully.
(3) In fact, this weapons system has offshoots still in use today.
(4) It was intended to be deployed at high altitudes.
(5) It went supersonic.