A treaty category for 10-inch large cruisers

Could a treaty create a large-cruiser category around 12,500 tons and 10-inch guns, with national allowances of ten, ten, six, four, and four?

Potentially, although the design might instead establish an unrestricted cruiser ceiling; a separate colonial category would call for larger numbers.

The question proposes a 12,500-ton, 10-inch-gun cruiser category with national allowances of ten, ten, six, four, and four ships. An existing class of large cruisers could help establish such a category. Alternatively, negotiators might use its dimensions to define the ceiling below which ships escaped numerical restriction, following the Washington treaty comparison offered here. A pre-existing 15,000-ton cruiser armed with 9.2-inch guns could therefore produce a ceiling around 15,000 tons and 10-inch guns. If a separate category served colonial duties, its allowance would need to exceed that for capital ships. The suggested British and American allocations are twenty each, with smaller allowances for the other powers.