Fixing the British triple 4-inch mount for dual-purpose use

Would it be better to divert the British triple 4-inch mount to coastal defence?

Only if the naval mount could not be made to work. The preferred option was to repair it as a dual-purpose gun and perhaps develop it toward 4.5 or 4.7 inches.

A triple 4-inch anti-aircraft mount is useful only if it works in service. Diverting the design to coastal defence would avoid its naval problems, but the preferred solution is to correct the mount. A successful dual-purpose weapon could engage surface and air targets. Developing the idea toward 4.5 or 4.7 inches is another option once the basic system works.