I'm not sure you could sensibly modify a typical pickup to track without a pre-groove to lock on to (i.e. blank disc).
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...and measure timing between each one (average over many revs) before start to get phase offsets for each to feed into PLL?
Depends on whether you need dimensional accuracy or just track-to-track repeatability I guess. That sounds like it'd work for the latter.
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I think it would work for either, no? Once you correct for phases of minor marks, everything is stable relative to the primary one.
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I think the issue is you can't easily correct for the spindle not being perfectly centered and the like. That'll introduce consistent error.
End of conversation
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