Here are some proposals for a different WNT. I was looking at a way to make a different treaty that would make them shop for their ships instead of just having something set in stone as to sizes and numbers.
Basically it would be like this
type Great Britain US Japan
>50k ton BB 2 2 1
40k ton BB 2 2 1
30k ton BB 4 4 2
Less than 30K ton BB 6 6 3
Armament of Ships 18"+ 16" 14" 12"
50K BB 6ea 8ea 8ea 14ea
40K BB 6ea 8ea 8ea 12ea
30K BB 8ea 8ea 12+ 12+
<30K BB 8+ 12+ 12+ 12+
As you can see it would limit both the size and gun armament of the ship. But you would be able to shop and decide what guns you would want with you ship.
Such a treaty is very much likely to be rejected on grounds of practical experience, given the huge difference in guncalibers in this suggestion. 12 inch was too light compared to opposing ships with 16, or even 18 inch. Even the 14 inch was already considered to be on the light size. Expecially Britain already setteld on the larger 15 inch gun as primary weapon for its battlefleet, supported by newly build vessels to have 16 and 18 inch guns. (By the way, the British had no 14 inch gun, except in HMS Canada, which was to be sold back to Chili. The slightly smaller 13.5 inch gun was capable of shooting a 1400 lbs AP shell, which was equal in weight to both USN and IJN 14 inch shells. 15 inch fired a 1920lbs AP shell, simmilar to the USN and IJN 16 and 16.1 inch AP shells of that period, being just slightly heavier, but lacking the capabilities of the British Green-Boy shell.)
Secondly, the treatyproposal is too much detailed, as it would result in more shipbuilding, instead of reducing it, given the new quota prevented existing ships to be retained, as these mostly were smaller than suggested. (All existing Briish BB's were much smaller than 30,000 tons, with the sole exception of the almost completed HMS Hood.) So at least 21 new hulls had to be created, meaning more than originally proposed. (Which was four to eight.)
Thirdly, the USN would have already build up to its limmits and needed to scrap newly completed ships instead, which simply was out of the question. (Scrapping the two almost complate Tennessee class and one completed New Mexico, to maintain just four 14 inch gunned ships in the line, as well as scrapping all Dreadnoughts up to the Pennsylvania's. This was uncacceptable. (If allowed eight, the Nevada's and New York's could be maintained as well.)
Japan too would be problematic, as it had no 12 inch gunned dreadnoughts, except the HMIJS Setsu. It was not planning to build more of this size, and only settled at 16.1 inch gunned ships for all classes, with a few even with 18 inch. The eight 14 inch gunners were prewar in design and not likley to be maintained for long after the treaty was signed. So the proposal was also to be rejected by Japan on grounds of practical and economical issues.