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clarence said..
I have done a fair bit of this type of sailing over the years. Biggest ones have been around 50km, with 35km between landings.
It is all do-able, with a few big "buts"
Don't make a long trip like that your first one offshore. Try it in smaller bits of 10-15 kilometres first (eg Bondi to Maroubra; or La Perouse to Cronulla).
Know your gear well and how it performs in different conditions. Be familiar with self rescue techniques (de-rigging and rolling up the rig on the board so you can paddle).
Make sure your gear is versatile enough to handle the conditions. I use a mistral raceboard or F2 lightning as they will get you there (and upwind) even if the wind drops. Don't use a cammed sail- if you get in to strife of need to roll up the rig and paddle home they are not great. Get an adjustable outhaul as it gives the sail a much greater range in variable conditions.
Your safety list seems pretty right, but add a legrope to it (attaching you to the board, not in a backpack). A mobile phone and a drybag to put it all in should also be on the list. Add a pocketknife with a screwdriver bit and a 10m length of 4mm cord (to tie everything up for self rescue or for towing). I carry all this gear in a "camelbak" style pack over my PFD with no problem at all.
The biggest issue on that stretch of coast is the variability in wind conditions associated with the cliffs/bays etc. I would suspect the wind could vary by 5-8 knots between the cliff lined sections and the beaches, then add to the that the natural increase in a NE wind as the afternoon progresses.
Given the angle of the coastline, one of the steady SE winds that can go for days in summer between 15 and 25 knots would be a better option IMO.
Clarence
I've never done a point-to-pointer like that on a board, but having Raceboarded a lot offshore from Sydney and done a lot of offshore yacht stuff around that area and elsewhere, I'd say Clarence, Salty and AUS4 have got it about 100%. There's not too much variation in wind strength between the cliff lined sections, but there can be a significant increase in really confused back chop off the cliffs, causing a very messy chop. If you're not used to it you could fall repeatedly, which could lead to fatigue, so going north of the harbour would be a safer option.