I probably can't give you the answer you are hoping for but my mates and I had eight Sanremo rims rechromed when we couldn't find replacements. One rim failed entirely (split around the flange at low speed) and another two pulled through the spoke holes. The chrome plater is experienced and has done a lot of work for us but trying to bring back the thin and badly rusted Sanremos proved problematic.
On my latest 2C I fitted flanged alloy rims from Central Wheel Components in the UK. The design is almost identical to the flanged steel Sanremo. Highly recommended.