How realistic would a carrier-based Sea Typhoon have been?
Short answerOnly with a complete structural redesign, because catapult launches and arrested landings are too demanding for the original land-based airframe.
NotesCarrier landings impose concentrated loads that a land-based fighter is not designed to absorb. Catapult launch adds another set of forces to the nose gear and forward structure. The panel therefore treats a Sea Typhoon as a redesigned airframe, not the existing aircraft with a hook attached. The name and some systems might carry over, but the structural work would make it a substantially new naval variant.