"Reuse" allow list settings for a group of allowed hosts for Embedding

I needed to duplicate the Embedding Allowed Host settings for 3 hosts, because they logically represent a single site. The duplication isn’t horrible, but it made me think about this feature as possibly useful: use the same “Embedding Allowed Host” settings for multiple domains.

I know it can make the UI clunky, but I’m curious whether others would like this. I don’t know whether I could build it, but I could dust off my Ruby chops and try. What do you folks think?