What Britain would need to change on Bearn

If Britain acquired Bearn after France fell, what would make her operationally useful?

Re-engineer the lifts, replace the deck-control systems, and improve the machinery enough to use her as a limited escort carrier.

The central problem was aircraft handling: the Royal Navy would need to redesign the lifts and remove incompatible rails and control equipment. Propulsion would also need attention if the ship were expected to keep up with demanding fleet operations. Even after that work, Bearn would not become a modern fast fleet carrier. She could still provide useful escort-carrier or deterrent coverage in the North Atlantic, freeing more capable ships for other duties.