Seizing or relocating the French fleet after 1940

How might Germany and France react if Britain seized the French fleet, and was there a neutral alternative?

A British seizure could save French face and deny Germany the ships, while moving the fleet to the Caribbean offered a plausible route to continued neutrality.

This counterfactual has the Royal Navy quietly take control of the French fleet after the 1940 armistice. Because Hitler had promised that Germany would not receive those ships, a British seizure could give French authorities a face-saving explanation for losing control while adding usable hulls to the Royal Navy. British possession was not the only solution: moving the fleet to the Caribbean could place it beyond immediate German reach and preserve its neutrality. The fleet's location was a political problem as much as a combat one because ownership, honour, and German expectations all shaped the outcome.