There were a range of 'marinised' Typhoon designs, which varied in the extent of the modifications applied. I have a sheaf of drawings and a brief about the aircraft, waiting to form the basis of a historical type article.
The 'full up' naval version had new main gear units retracting into pods, a strengthened nose gear, and a periscopic system for high Alpha approaches. There was a considerable weight/performance penalty compared to the land-based Typhoon, though the stats still looked pretty impressive - especially compared to F-35!
I hadn't heard that anyone other than historians and half baked journos were dusting down the navalised Typhoon.
The chief benefit of the Typhoon would appear to be that it might allow uptake of the full 232 aircraft order (perhaps even more?) thereby avoiding cancellation penalties. It would also open the door to a single type fast jet force. But development would be costly.
Otherwise, any withdrawal from JSF (assuming that there was not also a cancellation of the carriers) would surely be best 'balanced' by a buy of Rafale Ms or even Super Hornets?