I don't see the point of having all Africa 7's, India 5's, N. America 2's, etc.
Is there a legal requirement to use the same callsign as flight number? For pax and CC the flight number can still be EK201. Same for the info boards in the airport and your duty roster. In the front the callsign will simply be UAE53FT and the only mention of this callsign will be air-to-ground.