Dual-purpose secondary guns for a redesigned 1915 fleet

Would the counterfactual fleet carry numerous 3-inch quick-firing high-angle guns?

Yes, with both 3-inch and 5.5-inch weapons intended for dual-purpose use.

The proposed fleet would use high-angle 3-inch guns for anti-aircraft defence. The preference extends to a 5.5-inch secondary weapon, with both calibres intended for dual-purpose service. This is part of the fleet rebuilt with later knowledge available in 1915.