Testing hypothetical gas-turbine machinery in cruisers first

Could Nelson and Rodney have been the experimental ships for an early combined marine-gas-turbine installation?

Cruisers would probably have tested it first, possibly through a County-class experimental ship or a specially built batch.

The hypothetical machinery would probably be tested in cruisers before Nelson and Rodney were built. A County-class ship or a dedicated batch of cruisers is suggested for the experimental work. The battleships would then receive a system already tried at sea. The proposed sequence would prove the machinery in smaller vessels before fitting it to capital ships.