Replacing Hood's rocket anti-aircraft battery

What should replace Hood's rocket anti-aircraft weapons in a realistic refit?

Fit pom-poms, potentially an octuple mounting, because they were the practical British anti-aircraft weapon available before Bofors became the obvious choice.

Pom-poms are the choice, with an octuple mounting as a plausible installation before later Bofors weapons became available. The answer grounds the refit in the equipment Britain could realistically field at the time rather than selecting a later ideal weapon. This makes the exchange useful for historically constrained refit design.