wvreeven wrote: The polar alignment error is an angle calculated irrespective of the used coordinate system. The correction vectors are projections in the local azimuth and altitude system but could be any other coordinate system. As long as you make sure that the selected star ends up at the other side of those projected vectors, you’re good. Whether or not the mount is level is irrelevant.
This is not correct. The axes used for the correction matter. If it didn't and any way of moving the scope to put the target star in the calculaed position was OK you could use Ra and Dec movements to do this. This would obviously have no effect on the polar alignment.