New hulls for Queen Elizabeth and Revenge turrets would become Vanguards

Would new hulls using Queen Elizabeth- and Revenge-class turrets be better than the old battleships?

Yes; the result would effectively be Vanguard-type ships, combining existing 15-inch turrets with much more modern hulls and systems.

Removing 15-inch turrets from Queen Elizabeth- and Revenge-class ships and placing them in new hulls would reproduce the basic logic of HMS Vanguard. The modern hull could deliver a much more useful ship without forcing Britain to manufacture every heavy component again. Retained guns, mountings, stores, and industrial knowledge become assets rather than obsolete clutter when a design can reuse them intelligently. Vanguard can therefore be read both as a compromise and as evidence of the depth of Britain's accumulated naval matériel.