Triple-turret King George Vs and an earlier Vanguard

Could four 15-inch King George Vs and Vanguard have been built by avoiding new turret development?

Possibly: using established 15-inch triple turrets could have reduced development costs and helped bring Vanguard into service earlier.

The proposal is plausible because it would remove several new-development burdens at once. The saving is not treated as magic, but as a way to make a more standardised capital-ship programme arrive sooner. This reinforces the wider argument that turret and ammunition choices create fleet-level consequences.