Alter add_meta_box

The short answer is you can try but it just won’t be any kind of reliable. There was a similar question while back — get registered metaboxes by post type or post ID

Overall it is somewhat possible to fetch metaboxes like that, but it was never designed to work like that. Also it’s common for related code to check for post type (to not mess up unrelated ones) so it won’t work properly, even if meta box shows us.

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