Most operations in UAE are nationalised these days. I think Etienne was the last expat working operational for Adu Dhabi Police and I dont know of any ex pats in Dubai Police Air Wing.
If you were a pilot you might have had a chance but as a crewman there these days not much hope. The only option could be on the SAR helos that ADA are currently running but would say they have all their positions filled some time ago.