I hope you won’t mind if I DM you a solution rather than post it here.
The reason for that is my macro that does this sort of thing gets constant use by me, and I was already dreading the day that it would get scraped from the forum and added to the search engines, perhaps provoking Cloudflare to come up with a less pathetic system. 
Edit, 2026-05-09: See Click a specific point in an image that does not always appear in the same place - #5 by kevinb for details.