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?
2014 Convention Schedule-
ConnectiCon -Hartford CT July 11-13
Another Anime Con - Manchester NH October 17-19
~Cosplay 2014 Progress~
Sinon (SAO:GGO) 30% done (Prop Hecate II and Wig finished)