In terms of preserving value, exchanging the crystal is usually fine. Crowns are best left original if possible but may need to be replaced - if so, ideally keep the original. And yes, don't restore or polish cases unless the original lines and finish have already been polished away.
Your watch looks great by the way. I would service, clean (no polish) and replace the crystal if it were mine. And put it on a nice corfam style leather strap.
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