Me, I'd keep two of the 16" turrets and put one of Gerald Bull's super guns on the third turret for shooting people I really, really, really didn't like. I'd probably keep two of the double 5" mounts on either side, updated, and make the rest of the 5" mounts into phalanx systems. All of that would leave plenty of room for Tomahawks and anything else appropriate.
I know the Wisconsin already had a verticle launch system installed instead of the outboard mounted tomahawks.
Battleships have one big advantage the new ships lack – really good thick armor. If a small boat (or torpedo or cruise missile) did get through it would anger the sailors because they’d have to hang over the side and repaint the scorch mark.