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It might be fine on these cars, or one of those things where the natural frequency is so narrow and high that you just briefly cross it and don't get many torsional vibrations.
As for a lightweight flywheel, I've read that it changes the natural frequency that the crank will bend/twist at, and I've read it doesn't. It makes sense that it would change it, but it's not removing the damper, so essentially zero worry there, as you'll still likely not have a large spike in vibrations/twisting at a given RPM.
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