Oh noes, I need to work on that wig... I really don't know if it will work but it's worth a shot.
I have this wig that I used when I played a grandparent in Charlie and the Chocolate Factory at my middle school. It's a gray wig. It's all sorts of choppy and the color isn't solid (it's like a mix of darker and lighter hairs), but if I might be able to color it and style it so it looks right for Yuki. Aaaahhh...