IMHO, any approach is prematurely wearing out the rim. I don't do anything and as stated, it is part of the Patina. There are diminishing opportunities for C&V replacements over time.
Sanding or other abrasive methods reduces the the thickness of the side wall.
Removing anodizing layer removes the harder surface allowing for accelerated wear.
There are no new direct replacements for many rims. It is a consumable part.
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