A Japanese-style balance for a risk fleet

What might an effective risk fleet look like?

The Japanese model offers one answer: battleships backed by large armored cruisers capable of serving as second-line battleships.

Japan's combination of battleships and large armored cruisers is proposed as a sensible model for the requested risk fleet. The cruisers could also function as second-line battleships. That gives them a role alongside the main battle force in the proposed design.