I've got no worries about refurbing them myself normally, I can paint well and have all the kit I need just never had to deal with the corrosion like this before, typical jdm wheels really. The best way I see is to get them chemical stripped which they do.
I asked for the wedssport bronze the colour the sa70's come in. No problem they said.
They are extremely good at what they do, the cars in work have all finishes done and they look like new, the only way I can tell they've had a refurb at times is because there too glossy.
If I wasn't getting married in a few months I'd have them done with flat out.