German-Italian triple 15-inch turrets would accelerate a naval crisis

What if Germany adopted a Littorio-style triple 15-inch turret with Italian help instead of its historical twin-turret path?

It could produce 15-inch-gun Scharnhorst-type capital ships by the late 1930s, greatly increasing pressure on British construction and carrier operations.

The premise requires a shared weapon rather than simply fitting a German gun into an Italian mounting, possibly reducing the historical Italian gun's extreme muzzle velocity and short barrel life. Two fast German ships with nine 15-inch guns would force a sharper British response, make their battlecruiser label untenable, and intensify Mediterranean carrier planning. Participation in the Littorio program from the late 1920s could make a triple mounting available by roughly 1936, early enough to arm Scharnhorst and Gneisenau from the outset. British Lion construction and a larger Taranto strike would become more urgent because both the North Sea and Mediterranean opponents would field the same dangerous family of weapons.