Prewar super-sloops could ease the convoy escort crisis

What are the benefits of building heavily armed anti-aircraft and convoy-defense sloops before the Second World War?

A force of capable dual-purpose sloops would add both anti-aircraft and anti-submarine strength, reduce emergency pressure for Flowers and Hunts, and make early losses easier to absorb.

The assumed super-sloop displaces about 1,500 tons and carries three twin 4-inch mounts, 40 mm weapons, and anti-submarine equipment. A prewar force of eighteen to thirty-six would provide both anti-aircraft firepower and submarine protection. That starting strength would reduce the urgency of building Flower-class corvettes and Hunt-class escorts. It could also make it easier to resist pausing capital-ship and carrier construction. Losses would consume a smaller proportion of the escort force, while further construction would add to an already substantial fleet.