What treaty clause could have enabled escort carriers?

What would an escort-carrier clause in the London naval treaties have required?

A separate national tonnage allowance for carriers under 10,000 tons could have protected fleet-carrier tonnage and encouraged small-carrier construction.

A treaty clause could have created distinct allowances above and below 10,000 tons instead of leaving small carriers to consume the same national carrier total. Such a rule could have made a squadron of small carriers attractive, although Japanese industrial competition with the Yamato program would still matter. Small carriers needed protected treaty space because a different descriptive label would not change the tonnage accounting. This counterfactual links diplomacy directly to shipbuilding choices and fleet composition.