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I have not yet had the pleasure or pain of attempting polar alignment. However I think I understand your problem from you drawings. It seems your trying to find a way to confirm that your tube is parallel to the fork arms.
My attempt at a week suggestion here is to resolve the problem you have at hand.
Perhaps this might work. in Alt/Az mode point the tube straight down as you would when your packing it up. Then use a buble level on both the back of the Ota and on the fork arm base and when they are both level you know they are parallel. You could lock the tube then and mark the ota along the fork arm. I apologizes in advance for talking with no experience.
Another way might be to mount one of those buble level on the OTA and the Fork Arms and when both are in the same position u will know they are parallel.
Best of luck, I often find that the solution completely eludes me until I have defocused from it and am rested or relaxing.
Regards
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