Could the three navies jointly develop a fixed-wing V/STOL airborne-early-warning aircraft?
Short answerNo. It would add unnecessary development cost when a Sea King conversion already looks adequate on paper.
NotesA fixed-wing solution could offer an interesting capability. The governments in this scenario are participating because allies have assigned them a mission, not because they want an unconstrained aviation program. A new aircraft would require development, production, training, and support money beyond the carrier purchase. The Sea King AEW appears sufficient and uses an existing fleet. The new aircraft therefore loses to the helicopter already judged adequate for the mission.