Could a royal yacht also evacuate wartime casualties?

Could the roles of a royal yacht and hospital ship be combined in one vessel?

The former Royal Yacht combined royal duties with casualty evacuation, but the answer distinguishes that role from a full hospital ship.

The former Royal Yacht is described as combining royal duties with casualty evacuation. Evacuating people is distinguished from operating a full hospital ship. The brief answer supports that limited combination of roles without specifying a new hospital-vessel design.