There is a 15x7" Mopar wheel, that looks totally at home and does in fact take the OEM hubcap. there's a picture somewhere in the gallery of a 220 wearing them I think. The only outward difference is that it has more ovals, and the ovals are smaller. Not an easy find, they were a police interceptor wheel; are super heavy -over 21 lbs- and the only guy I met who has run them got rid of them in a big hurry. They rubbed with 205/60?55?/15s. I'm sorry, don't know what their backspace is.

Quiant, but there's better, lighter, cheaper options if you need to run 205s.

There is a list of agreeable rims floating around, but no backspacing info that I'm aware of. A lot of folks are happy with ford ranger wheels.

Stockton Wheel in CA is all I know of. And yes, p-r-i-c-e-y.

late 444s/544s have interchangeable boxes, 444 having the quicker ratio, but I don't think there's anything to be done for the 122s. However, someone here has fit a VW bug box to theirs, maybe it will come up on a search.
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'64 PV544, '66 122s, '70 142s... Blue is Beautiful