I've tried several implementations of creating a vertically filled two-column layout with one-column content below without a clearpage, but have found no success. In my attempt to use the multicols environment, I can't get rest of the page to fill vertically so as to keep the rule but have the one-column content display below. In my attempt to use the multicols* environment, I can get the page to fill vertically, but cannot get the one-column content to display on the same page, as shown in the image below:
I've also tried placing the one-column content in the footer, but the rule then overlaps into the footer.
I'm open to any solution, package or environment, though the twocolumn option for documentclass probably won't work for me as this is a portion of a collection of documents.