Update - managed to track down a set of OZ's for a good price. Outer rims could do with a refurb, centres are immaculate (which is ironic considering I'm thinking of colour-coding the centres, but good paint underneath means less work)
Currently considering whether to polish the outer dishes (very shiny, but high maintenance), or silver powdercoat instead; it'll be less dramatic but harder wearing, and should also still contrast ok against Azuritblau centres.