Sounds a fantastic trip.
You realise that coastline is called "the shipwreck coast " for good reason
with over 500 recorded.
Notwithstanding it is a magnificent coast from the Ocean in good weather. In not so good weather or at night it can be treacherous for the inexperienced. Nearly ended up on the beach at Warrnambool in a rough Melbourne to Portland race one night on a Bounty 35.
Admiralty Charts a must imo as there are many rock outcrops
Can be a busy shipping highway and they come up pretty fast so keep an eye out .
Been to Port Campbell a few times ,by road, and never saw a boat anchored In the bay.
The cray fishing boats are lifted in and out by the crane on the wharf .
Talk to the various yacht clubs along the coast such as Portland and Apollo Bay for local info.
eg. Cape Otway below . That white water are rocks offshore. I would keep well outside Some braver than I would cut the corner and go inside

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Edit. What wongaga says