An extra battlecruiser in the hunt for Scharnhorst and Gneisenau

In a World War I or II task force scenario involving tabletop fictional ships, which ships would fight?

Taking a British Second World War scenario, an upgraded additional HMS Revenge would join Repulse and cruisers against Scharnhorst and Gneisenau, with Nelson and Rodney following.

In a Royal Navy version of the tabletop scenario, the preferred addition is a battlecruiser named HMS Revenge, upgraded during the interwar period. A fourth British battlecruiser would allow Revenge and Repulse to pursue Scharnhorst and Gneisenau together with cruiser support. Sending two 15-inch-gunned battlecruisers forward would be a different proposition from sending Repulse alone. They could damage or slow the German ships, with sinking them also a possibility. Slowing them would give Nelson and Rodney the opportunity to catch up and bring their heavy guns into action.