Believe it or not, Weldcraft wheels has a fantastic reputation, even though their website really needs some presentation work.Where would you get something like that done? I've seen it once, TurboPhil has a set of Toybox wheels that have been widened, so clearly it can be done. I'd be terrified to hand over my cup wheels though. I'm interested in hearing about how this goes if you decide to do it!
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I was quoted $215 a wheel to add up to 2", and another $50 each wheel to flatten the welds (which I'd do, of course).
The problem with going too big, as you might imagine, is that the wheel is already a +38, so even adding an inch makes it +63, needing a 15 to 25mm spacer (depending on the tire you run. If the wheels were a lower offset from the factory it'd make things a lot easier, but we can't have everything.
The ONLY reason I'm considering doing this is because my set of 240R wheels is mis-matched (silver fronts and black rears), so I have to get them refinished anyway.