Going to have to go back to the drawing board on the engines and turbine. No one alive and deployable knows how they work. Could pull them and drop in couple of AW4 nuclear reactors and she’d scream.
It was considered briefly - the old propulsion system is probably not maintainable these days. The problem is that "drop in" part. To replace the propulsion systems would require cutting through either the armored deck or the armored (torpedo belt) hull. Good luck with that one.
The Soviet Union - sorry, Russia - had to do something like that when they attempted to upgrade the Kuznetsov's boilers. The operation was successful but the patient sank at the dock. Bummer.