Use the ones we have that way. Their durability in combat would be unparalled among contemporary navies.
They are built like...well...like battleships.
The last four BBs are magnificent but really belong in museums...
Would they hold up to a refit? I would suspect it would cost nearly as much as a new platform specifically designed for those things I suggested.
I just think with the ability of the rail guns to hurl shells now hundreds of miles and the sustained rate of fire of multiple batteries, this would be an excellent platfor for bombardment of fixed installations while staying safe much farther over the horizon.