Take a look at this topic about using term meta http://support.advancedcustomfields.com/forums/topic/how-to-use-wp-term-meta-on-acf-the-easy-way/. If you’re not aware of it term meta is something recently added to WP. I’m assuming that eventually term meta will be used in ACF without doing the extra work, but for now it will help you with this since it will let you do a term query that include meta queries.
