I wish I could help. Being a Komui cosplayer and all, but I only use my realy hair for Komui since it's the right lenght and I always dye it black/blue....sorry. Have you tried asking a commissioner to help you find the right wig?
~2016 Con Schedule~
Anime Boston, Boston MA
Another Anime Con, Manchester NH
Hisoka Morou (Hunter x Hunter)
Caesar Zeppeli (JoJo's Bizarre Adventures)