Saber Rider said:
I'll be using the name Вишеслав Воиславић (Višeslav Vojislavić or Vojislavich) a Serbian noble seeking to fight alongside his Orthodox/Pagan brothers.
Well, can't say having a Serbian noble in this scenario would make much sense.
Anyway, would you prefer the Serbian Old Church Slavonic form of your name rather than the Modern Serbian one? That should be Вышеславъ Воиславичь (Vyšeslavŭ Voislavičĭ).