We can change the item on https://github.com/Islandora/islandora/pull/438/files#diff-95bc110a1681b13a697ea273708ad030L192 to be of type tableselect which will render out a table with a checkbox as the first entry for us (https://api.drupal.org/api/drupal/developer!topics!forms_api_reference.html/7#tableselect). Shouldn't really re-invent the wheel when we have it already built in for us.