Hi !
sorry, but that won't do the trick, as $field is not an argument in that function. I won't be able to get the 'id' parameter of each declared metabox to copy the meta for the declared ones and only for them.
would there be a way to get, from there, all the defined metaboxes, so I could chain on the list, select the reverse_post ones, then copy data only for those for the given post ?