I wish you good luck with getting those flights past a safety conscious boss!
Well done! 100%!
Every one of those scenarios does NOT require an alternate - assuming the cloud base and visibility were above the minima (which you did not state).
Have to pull you up on a little something, however. About Jundee, you said:
... no navaid but LSALT +500 and 8km vis so tick ...
This passage has no relevance to Jundee. Can you see why? Hint: Jundee has an instrument approach.
The "safety concious boss" (is there such a thing?) could always write his own (additional) alternate requirements into the Ops Manual. If he did, he might find that he has put his operation at a significant competitive disadvantage!