Ok, one more wild hair on this. 🙂
What if I made a field that would concatenate the two fields in the desired format and then point the Display Expression at that single field containing the combined attributes... is there a way to automate concatenating two fields whenever a new record is created? I know you can manually do this with field calculator in Desktop, but that seems a bit time consuming if you have to pull the FGDB down, use field calculator, and then upload it again every time the field crew gathers new records.
John