Panasport?
For my Lotus Eleven replica, I bought Panasports from Leitzinger Imports/Leitzinger Motorsports (somewhere in Pennsylvania several years ago). Since I used Triumph GT-6 front suspension/hubs/brakes and the rear axle is from a Mazda RX-7, they fixed me up with front wheels intended for a Honda CRX, rear wheels intended for a Toyota MR-2, but not yet drilled or machined. They machined and drilled to the Triumph bolt pattern front and rear and machined the hub centers to match the Triumph front and Mazda rear. When I had the axles shortened, I had the hubs fitted with 7/16" studs in the Triumph bolt pattern. The guy I dealt with (at Leitzinger) isn't there anymore and, in fact had his own business for a few years, but has closed that. However, if Leitzinger could do this then, assuming Panasport wheels are still available to someone with blank centers, it would just be a matter of matching wheels intenede for other cars that have similar calipers and wheel offsets. At the time I bought my wheels, I was pretty impressed at how inexpensive it was. Like not much more than the price of standard wheels. I don't know if I lucked into a good situation with someone willing to help out or if this is not really such a difficult operation. Again, as others have mentioned, the 6-1/2" front wheels might be a problem in the correct offset. I think there are Miata wheels in that width, but they may not have the right offset or clearance for calipers.