Agree regarding the number of Sea Harriers but, if there were no submarine threat, more deck space would have been available and I'm pretty sure that we could have deployed more RAF GR3s. These would have significantly enhanced our ability to support the ground campaign.
The Sea Kings were indeed invaluable in numerous roles, but the overwhelming bulk of the SK Mk5's task was ASW....to counter a small, relatively inexpensive, relatively unsophisticated, but nonetheless lethal, threat.