I think you've got most of the advice you need from the rest of this thread.. I have the polar scope and you can certainly do accurate alignment with it from Bendigo skies, but it is over-priced for a polar scope.
Otherwise the combination of an inclinometer and sighting to where Sigma Octans is in the sky is quite accurate.. maybe not quite for 8 mins but with a wide angle lens it could be close.
My TiltBox inclinometer generally gets me within half a degree altitude and I find I can sight to within a degree or two for azimuth as well. Sometimes that's all I do, otherwise that puts Sigma Octans comfortably in the polar scope for final alignment.
Phil
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