I don't see any point in wasting perfectly good ammunition.
Leave the 16 inchers on, maybe modernize the 5 inchers put on a few Vulcan chain guns then cover the deck with cruise missiles launchers.
Nothing says from Uncle with love like a shell that's weighs more then a Volkswagen!
Also that armor probably could take a hit from any number of nonnuclear cruise missiles and not scratch the paint. I doubt if these missiles have amour piercing warheads of sufficient strength
Wasting? There's nothing else that shoots 16" ammunition. It would be a waste to have it decommissioned unused.