Move elements of UI to second display?

My game has draggable UI radar screens, to help players see what’s going on. Several users have asked how they can drag these radar screens to a second monitor. If I’m not mistaken, with Unity Multi-display each display requires its own camera. I’m wondering if it is possible to make UI elements draggable to a second screen.

Have a second camera offset to the right (or whatever) or the main camera so that I can only see items that have been dragged across the entire main screens viewpoint and into its view port.

Haven’t tested this myself but I’d have to imagine that it would work.