Yes, that's a good point. You can bisect the distance if you can visualize the star that close to the horizon. It depends on the arcus visionis. If you can stay consistent even with a high arcus, it can be done
If alpha-Draconis was used, two possibilities can be also considered....Letopolis' orientation was aligned and G.P. aligned to Letopolis or the foundation of the Great Pyramid was in place before the Fourth Dynasty.

Thank you.