Hiya - yes my winter wheels are Speedline Turinis without a centre cap. I'd found the hub nut thread and general area was getting quite crusty even within the first year or two of owning the car (not sure the standard wheels with the centre caps were helping that much).
Back in 2022 I rubbed down all the rust (small wire brush drill bit), treated it with rust converter and repainted with hammerite black spray. Seems to have worked pretty well as the rust hasn't returned yet even running the Speedlines through several wet/salty winters now. I do spray a bit of bilt hamber dynax on the area when I change the wheels over each year to help.
Some before and after pics below...
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Cheers, Chris