Could a Dominion have preserved Warspite?

Would Britain have sold Warspite cheaply to a Dominion for preservation after the war?

Probably; the postwar government would likely accept a scrap-value offer rather than reconsider preservation at home.

The counterfactual depends less on technical feasibility than on a buyer appearing before scrapping. The contemporary government appears willing to take the money without asking whether Britain itself should retain the ship. Preservation would be an institutional and political accident rather than an inevitable reward for distinguished service.