there is a filter that lets you alter the query for the post objects http://www.advancedcustomfields.com/resources/acf-fields-post_object-query/. It might be possible, here is an example http://wordpress.stackexchange.com/questions/29918/page-template-query-with-wp-query
There could be a problem using this on pages because they are hierarchical and altering the query arguments for a hierarchical post type can cause odd behavior. Basically, if the changes cause a parent page to not be listed then any child pages that should be will also be missing.
