As we all know, this is a forum for Kingdom Hearts. Even so, if anybody posts spoilers for Endgame anywhere on this site without spoiler tags, you will be banned.
If you change your avatar to something related to Endgame, you will be banned.
If you put something in your signature, send a message to somebody that is visibly seen, or share spoilers with somebody who does not wish to see them, you will be banned.
Since its only $10, you could get some blue paint over the 'eye' and then carve a slit for the pupil. The, depending what the blade is made from, sharpen it and paint it over. But ultimatley, there isnt much you can do to save that thing.