Are you considering doing some DSO imaging with your setup? If you aren't why do you need to put the scope on a wedge?
If you are going to do some imaging (or just want to use the wedge) then the best way for you to polar align would be to drift align it. For visual work only though you could get away with adjusting your altitude by cutting a triangular board with the narrow angle the same as your latitude, rest the longest side against the plate of the wedge and put a level on the top. Once you are level your wedge should be set close enough to latitude for you to do visual observing. For you azimuth adjustment, find out the magnetic deviation for Sydney and subtract or add (as needed) to your magnetic south reading of the compass.
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