Hey Freak. For once in my life I can say that without it being an insult.
The easiest solution for you would be to delete portraits_turkish.gfx in the /prp_all/interface directory. This will revert the Turkish portraits to the original DLC style (or default Muslims if you don't have the DLC). The only downside to this is that you won't get any differentiation between pagan and non-pagan Turks. If you want that, you'll need to do some text editing. Open portraits_turkish.gfx in a text editor like Notepad. Find and replace all instances of the "muslim" with "turkish." I believe that will do the trick, though no guarantees. I'm telling you all this from memory; I didn't actually test it.
Thanks a lot, I deleted the portraits_turkish.gfx and portraits_steppe.gfx and that got the desired effect.