Used so You dont know how much older or the previous owner, Right?
If I need to replace a rim, and have a second Identical Rim, I reuse the spokes , without un lacing the pattern.
Just to keep my life simple ,
tape the new rim to the old one and un wind all the spokes equally and then Move them 1 by 1.
cannot you polish and clean that hub without tearing the wheel apart ? You going to do that every time it gets dirty?
'/,