Reworking Ibuki after a carrier conversion

What could replace Ibuki's catapult equipment if it were removed?

Little can be added without major reconstruction because the carrier conversion would have to be stripped back to the main strength deck.

The response treats Ibuki in her carrier-conversion form, where the former catapult area cannot simply become an empty equipment position. Reusing it would require stripping the conversion back to the main strength deck, the structural level that holds the hull together. The explanation contrasts this arrangement with British carriers such as Ark Royal and the Illustrious class, whose flight decks served as strength decks and could support substantial armour. Under that interpretation of the question, the proposal requires major reconstruction.