At the risk of offending those who ARE competent with one... MOST shooters of guns that orginally came with custom 'turnscrews' would be best advised to consider them only as case decorations. That said...
An option would be have a set made. I have discovered a very interesting BBS system dedicated to the art of the forged blade. The guys there would be most competent to make you a fine set, out of the alloy you chose, finished to whatever standard you want. Railroad spike to super stainless, pine to ivory... they use it all for knife work, seems like a perfect match to custom tool sets. Best of all, they know steel and heat treating and could make something not only beautiful but functional.
Dfoggknives.com Select bladesmith forum. To see the pix and post you have to register and use your real name. It is a very civil group of talented people.