Who to make the handle?

I know some of the makers will not do a 30 mm

I say go with Rudy Vey. He can pretty much do any shape in almost any color your heart desires. Plus he has a quick turn around time and keeps you informed throughout the process. He's just great to deal with all around.

How about PC Woodcraft (http://www.badgerbrush.net/)?

I can make handles of any shape for 30mm knots. The caution with large knots is that they tend to shed more. It is always better if you procure your knot that you love first for me, IMHO.