Just my opinion, but I actually think through evolution the Clown Tang is the Pacific's Sohal Tang, while the Sohal has pretty much made the Red Sea its' home. They have some very similar markings, behavior traits, growth rates and feeding habits. I believe another name fore the Sohal is the Red Sea Clown Tang.
At any rate, if you can make that work, more power to you. Clown tangs are notorious for wasting away in captivity, and I'm pretty sure the Sohal will put it through its' paces, unless it's a considerably larger clown tang.