This is a bit embarrassing, and will be a gift to our RN friends but it is hard to overstate how unusual fast jet weekend flying was then!
( Nimrods, yes, yes I know)
I’m sure that Harriers took part in that Mallet Blow.
I very much doubt that it was extended into a weekend.
Mallet Blow areas did not extend as far North as Calvine but a Harrier COULD have detached to Calvine but would have had to land at Leuchars / Lossiemouth thereby attracting attention.
In short, I don’t think this avenue of inquiry will help much.