Bulk Edit Page Feature Image

My goal is to set a header image for certain pages.
I’d like to be able to set a featured image for several pages at once from within the Dashboard. The process would be to select several pages in the WordPress Dashboard and then under Bulk Actions select Edit. The image could be selected from here.

The other option would be to code an if statement somehow. If page root ID = x then set feature image to a, if page root ID = y then set feature image to b, else set feature image to c.
Using this method I think I would run into issues with posts because I don’t want the feature post image ever to display in the header.