Well I really hope you guys are wrong, the ones that say it can't be done.
I wanted wider rims, at the time I choose the Cookie Cutters. The guy that did mine, is all he does is Alloy rims, his name is Eric Vaughn; 1-626-358-6413 Eric is very slow, but very good at welding the Alloy rims. I also know of a company that does Steel. How is does it is on a lath, he cut off the outter ring. I don't know if he does 19' but give him a call.
The outside rim is a blank Eric buy for your project. The weld, will there is a machine he jigs up your center section. The weld process is automated, damn good work