I have solved similar issues with two GUI-dependent methods (and note that GUI-dependence results in less-than robust reliability):
• Use KM’s “Found Image” set to the column header, and click (or double-click?) at the vertical offset you want.
• Count the {tabs} from a freshly-loaded page that takes you to the selection you want, and run an Action that repeats {tab} that many times. For this to work, I think you get better results with "Safari ▹ Preferences ▹ Advanced ▹ Accessibility ▹ Press Tab to … " checked.
You might look into repurposing the script that was recently provided by Chris that gets the page source and searches it by regex.
And you might look into ShortCat (which I don’t use but would love to).