Hey Mike,
In this scenario, I think JavaScript would need to do the heavy lifting rather than CSS. The Canvas front page section that is editable is situated beneath the Announcements component in the DOM. The Announcements component has this ID:
<div id="announcements_on_home_page">.
It's possible you could target that specific ID with custom JavaScript at the account level and switch its position in the DOM but you'd need to be sure to target only the course you're changing, unless you want to move it globally for every course.
The thing I'd be most worried about with this route is Instructure changes Canvas components so often that it might be something you're constantly having to fix.
Not the most helpful answer here but something to think about.
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