Pull the guns, convert Resistance to a carrier, use those guns for an earlier Vanguard. The RN isn’t short of fast battleships once the KGV class start coming online, but carriers are needed.
If you already have
Resistance its better to skip
Vanguard altogether in favour of 1 or 2 extra new carriers.
Depending on only one spare 15" turret being available in 1939, with thanks to
NOMISYRRUC for the list*, we can skip building one of the
Roberts Class Monitors as well to free up the necessary slipway at
John Brown, Clydebank or
Vickers-Armstrong, Tyneside.
(*We might need to think about the turret count here. HMS
Roberts used a turret re-cycled from
Marshal Soult. HMS
Abercrombie, had a turret built as a spare in case of a failure in
Furious 18".
Marshal Ney never used her turret in action and it was transplanted to
Erebus or
Terror. Which I think NOMISYRRUC means you have the right number of turrets constructed, but not necessarily the correct dispositions. It all depends on whether the Follies are built, and how. In a case of no Follies and just the turrets for
Resistance and enough for the WW1 Monitors being built there will only be 53 completed.)