I think that question is solvable easy-
There is a way to add custom meta box. You can basically copy this from here: add_meta_box
Now, make a checkbox in the custom meta box and a hidden field with the post id. Instead of updating post meta with
update_post_meta( $post_id, '_my_meta_value_key', $my_data );
you now can do update_option in WordPress which is global.
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