craftgrrl | Need some help with a doll I'm making...

Basically, I'm making a Mad-Eye Moody doll using an approximation of the porcelain doll method: sculpey head, hands and feet attached to a stuffed fabric body.

I made the hard parts already:

(Sorry, haven't finished painting the boot or the peg-leg. Also, I left the top of the head a little short because doll hair tends to be waaaay too high.)

The problem is that I assumed I would be able to walk into a craft store and find grey hair in the doll-making section. AS IF.

So, I'm thinking of trying to make a wig with the following method:

Taking a piece of bone-colored tulle, placing it on the head, and then tracing the area I want the hair to go.
Placing the tulle in an embroidery hoop, and then using a latch-hook method to attach embroidery floss to the tulle. (I can make the teeny hook, so that's covered)
Seperating the strands of embroidery floss
Attaching the wig to the head, and then giving the doll its haircut

Do I need to bind the edges and fold them under before attaching the hair? Should I use an interfacing? Are repositionable adhesives a bad idea? Is my process completely flawed?

Anyway. Thank you for taking the time to read this, and double thank yous in advance to anyone with suggestions! ^_^