What could the Allies do with a captured Deutschland?

What could an Allied navy realistically do with a captured Deutschland-class cruiser?

Use it for roles such as Arctic convoy escort or distant patrol, not for high-speed fleet work.

A captured Deutschland-class cruiser would be useful for its endurance and the simple fact that it was an available hull. Arctic convoy escort, service with the Polish Navy, and Indian Ocean patrols all fit its strengths. Its limited speed would rule out operations that depended on keeping pace with fast fleet units. The Allies could still employ it heavily in distant escort and patrol work.