Manning an Incomparable-sized carrier in the 1920s

How could the Royal Navy find two or three thousand people to crew an Incomparable-sized carrier in the 1920s?

It could redirect personnel released by treaty-era ship retirements, and the carrier would need fewer heavy-gun crews than the battlecruiser from which it was converted.

The Royal Navy could retain personnel who would otherwise leave as the postwar fleet contracted under treaty limits. The manpower argument draws on a naval force hundreds of thousands strong and the crews released when older capital ships were retired. The surviving First World War King George V-class battleships, for example, would leave service as Nelson and Rodney entered, releasing more men than the two replacements required. A carrier conversion would also dispense with Incomparable's 20-inch gun crews, their magazines, and much of the secondary battery's manpower. Pilots and aircraft maintenance personnel would add their own requirements, but the expected total would remain below that of a modern supercarrier. Supplying the large air group could create friction with the RAF and provide another argument for returning the Fleet Air Arm to naval control.