Not sure if it would be desirable to do so in the `islandora_paged_content_get_enabled_ingest_derivatives()` function--maybe in a separate function in the middle--but we should probably filter these is a manner analgous to how we do so on the admin forms: https://github.com/Islandora/islandora_solution_pack_book/blob/7.x/includes/admin.form.inc#L79-L93