Ryujo and a cruiser-carrier treaty category

Could four successful 10,000-ton Ryujo-type carriers force the London treaty to recognize cruiser-carriers?

Yes; a separate category near 15,000 tons could keep Japan in the treaty while accommodating small carriers already held by Britain and the United States.

Four effective 10,000-ton Japanese carriers would be too important to dismiss as a one-off and could make Japan reject the first London treaty if counted against full carrier tonnage. A compromise category around 15,000 tons could also absorb ships such as Argus, Hermes, and Ranger while granting the larger treaty powers more total tonnage.