Peter I've been using a digital inclinometer in the manner you describe for years with great success. I generally put it on the top (or side) of the cooling assembly of my QHY9 while parked, then rotate the camera and FW assembly to the PA figured out earlier in pre-capture planning. Check PA with plate solving later, but very rare to not be within 1-3 degrees of where it should be.
They're great things to have in the field, or for zeroing dec axis on cheaper mounts anyway.
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