A surviving Force Z becomes the core of an eastern battle group

If Force Z survived the Japanese air attack, how might Britain reinforce and command it?

A senior admiral, possibly Somerville, could command from Repulse while Renown and a carrier reinforced the surviving battle group.

A surviving capital-ship force would draw reinforcements instead of continuing as an isolated pair. Britain could fly a senior admiral to the theatre and use Repulse as the command platform. Renown and an aircraft carrier would be logical additions if the timeline allowed them to move east. Admiral Somerville is the likely commander, turning the survivors into the nucleus of a coordinated ABDA or Eastern Fleet battle group.