I did a set fof 16" for myself on a large lathe. Commercially, look up Wheel Works in New Jersey. The owner is named tim. He has done a number of wide 5 wheels for us.
Try this fella if he is still at his shop, Mike Sterns, Doo Wop Rods, Ardmore OK.
cell...580-504-6464. I met him several years ago while teaching a class in town.
There's a shop in NJ that does very good work. A search may bring up some previous post with his contact info. If I were home I could find and post his contact info.
try http://rallyamerica.com/ who is wheelkid on the hamb. They build their own wire wheels so no doubt they would be able to do something with your wheels.