Very simple. Instead of having the tag added via your ArmA profile, why don't gang tags work similar to the "Police Cadet xxx".  Essentially when you create a new gang at your house, when you enter the gang name you also have a prompt to enter the gang tag (up to 5 characters) that would then be placed in front of your name. Ex. If you wrote: "[-ß-]" in the box it would result in [-ß-] Ranger