Treaty frigates and the early escort shortfall

What if naval treaties created a frigate category for fast anti-submarine escorts?

A counted frigate category could turn fast ASW escorts into a treaty obligation and pressure Britain to build the ships that an unrestricted sloop category did not guarantee.

The hypothetical frigate is a fast anti-submarine escort, roughly destroyer-sized but optimized for depth charges rather than torpedoes. Existing sloops were unrestricted, so governments could decline to build them without breaching a treaty commitment. A counted frigate category might have pushed Britain to build more escorts before 1939, narrowing the shortfall that gave German submarines an early advantage.