Fwiw anodizing is not hard to strip off and replace. A battery charger and diluted sulfuric acid are all you need to anodize. You could easily experiment with
some scrap aluminum that you anodized then sanded in the same way as you have already done to see how a repeat anodize on the scrap looked to see
whether you would want to remove the rest of the anodizing before reanodizing. A google on anodizing should point the way and sulfuric acid is used in some
drain cleaners. Oddly the lye variety drain cleaners will strip off the anodizing but unless used carefully will etch
the aluminum, not cosmetically good, necessitating a buff and polish to recover the nice Cinelli look.