As mentioned the DT Swiss 1650 wheelset had damaged rims but the hubs were fine. So I sourced some Kinlin 300 rims and some aero spokes on ebay to build a new set of wheels with.
Pleased with my purchase I thought I'd do a quick mock-up and... nooooo!! Yep, the aero spokes didn't fit through the holes on the hub, should've thought about that beforehand maybe! After a quick google I found the solution - slot the hubs with a jigsaw blade (shown on the second pic). Thankfully the holes only needed a couple of extra millimeters, the slots can't even be seen behind the spoke head.
Then the plan was to paint the hubs matt black. But the water-based paint I bought failed to go off, even after a few weeks. Maybe it was the paint or maybe I sprayed the layers too thick?
So that was removed, which led to another idea I'd had from the beginning, a polished finish...