I was just about to mention how I requested this years ago, and then I read the mod page and see the link to my old thread.
Here is my live reaction to seeing my old idea brought to life!
Why don't you just set the TSLPatcher to insert the Vulkar's utc files directly into .mod files?
What .mod files are are files which contain a module's information without touching the vanilla module files, this allows modders to "clone" a module's content so that we can mess up whatever we want without messing up the vanilla game files. If this mod's TSLPatcher injected the utc NPC files into the .mod files, you could modify the Black Vulkar's in tar_m03aa.mod, tar_m010aa.mod and so on without causing a single conflict.
The K1 NPC Overhaul mod, K1R and the K1 Community Patch utilize these .mod files so at worst your mod would require one of those three mods to work... however, most people use K1 Community Patch nowadays so it shouldn't be an issue.
Good idea, but the red colour used is a different, brighter colour red from that on the republic soldier's uniform (Trask's). I think it should be the same.