They're all built that way. Ingalls were pioneers in that technique forty-odd years ago.
Any significant structural replacement would probably go that way in any case. The island (which is ally by the way) would be a new fabrication. The real cost will depend on how much cabling has been damaged / destroyed internally, particularly below the hangar deck where watertight integrity issues significantly affect the ease of replacement.
Personally think she's a CTL, but will depend on operational priorities. Digging any of the old LHA out of reserve would be similarly costly - particularly for F35 mods.