If it helps, Hampshire Electroplating is the company Sawzall uses and he seemed to think he could chrome aluminium rims OK, and he was quite competitive on the frame etc (I just couldn't be bothered to drive to Southampton from Bournemouth three times as I wanted it dechromed, repaired and rechromed so I got a local company to do it).
They seemed quite helpful on the phone but they want to see the item before it is chromed. Might be worth a call you can't find NOS - I didn't bother because I bought PKRadman's mint Araya's for less than I could get mine chromed for. Might be a bit harder to get mint chrome pro class wheels....................