I would also really like to know how an email popup form could be triggered if the announcement bar is clicked. I guess that sort of falls under the same umbrella as the original question.
I'm using the default announcement bar in Debut theme. And the Popup form is using Klaviyo. Currently the behavior is that the popup form shows up when the page is loaded. But I need the user to also be able to show the form when they click the announcement bar (or any button, like in the original question)