How do they warp from sitting? I've never heard of that!? According to how warped they are and how much thickness is left, I would think any brake shop should be able to turn them. I've had drilled rotors turned. I wouldn't think slotted would be that much different as long as they take their time.
A machine shop equipped with a grinding attachment for a lathe could definitely do it if it can't be turned conventionally.
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