Tony, not to hijack the OP's thread, back when I shot NRA 2700, I shot a K38 Masterpiece single action in all 3 stages. Honestly, I never saw any other revolver shooters shoot their revolvers double action. Shooting a revolver single action at 25 yards or at 50 ft, is not that difficult with aimed fire in either timed fire or rapid fire stages. With practice, you will actually have time to spare when you develop a muscle memory cadence.
The difficulty of shooting a revolver in a timed or rapid fire stage is not getting the shots off in a timely manner, but to minimize the revolver movement "in the shooting hand" while thumbing the hammer. With a semi-auto, there is minimal gun shift between shots in the shooting hand, compared to a revolver. By shooting one-handed single action, you have less sight "wobble" than you have shooting double action.