Refinishing the camera with the knobs in place should be OK since the metal knobs should be resistant to the finish applied.
But another thought.
Are the cross-axles (focusing shafts) affixed to the camera with pressed metal clips which are then screwed into the wood? Or do the axles actually thread through the wood?
If the former, then they conceivably could be removed non-destructively....
Just thinking out loud....
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