It is unclear to me what the general overhaul of the engine should have to do with the clutch and why the latter should necessarily be dynamically balanced, although frankly it is not clear to me how this should be done with a mounted clutch inside the car?! Millions of cars drive around with clutches that are statically balanced at the factory. I have never heard of a clutch unit that has not been dynamically balanced leading to engine damage. Vibrations and leaking seals would be first in line.
Buy a high-quality clutch unit and you're done!
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