Actually, you can adjust what is displayed by using this filter http://www.advancedcustomfields.com/resources/acf-fields-relationship-result/
If you skip trying to order them by the fields that would work.
For my original suggestion, basically you’d need to do all the work yourself with both querying post and ordering them, and on top of that all you would get is an array of IDs and would not be about to get post objects. Using a select field is overall far more complicated on the back end and front end.
