Could the Netherlands have bought British 14-inch guns for the Design 1047 battlecruisers?
Short answerYes; Britain would probably have supplied twin turrets, allowing a six-gun 14-inch design.
NotesThe Dutch Design 1047 was planned around 11-inch weapons, but the British had already developed a twin 14-inch turret. Britain would probably have been willing to sell that system to the Netherlands. Three twins would give the ship six 14-inch guns and move the project toward a much more powerful battlecruiser concept. Access to an ally's existing weapon and turret work can transform a smaller navy's design options.