Iron Duke as a hospital ship

If HMS Iron Duke had been converted into a hospital ship, how long would she have kept the role and what would replace her?

A post-retirement conversion could plausibly last a long time, but an earlier conversion might be replaced by a politically useful dual-role ship.

A late-life conversion of HMS Iron Duke could plausibly have remained in hospital-ship service, while a conversion undertaken in the 1980s would have faced later political decisions about whether to retain her. A replacement might have combined hospital facilities with royal-yacht duties. The counterfactual ties the ship's service life to government priorities as well as the usefulness of the role itself.