Unpublished Status for Solution Articles - For Past Review Date and Archived Articles

We are having a hard time managing one “Draft” bucket for solution articles. It is not possible to determine the true state of draft articles - whether they are actively being worked on for future publication vs. which articles were put automatically in Draft status because they are past their review date. We would like to see another status category of Unpublished where articles past their review date automatically go. Authors would also be able to choose Unpublished as the status for any articles that they want to temporarily or permenantly “archive” and make unsearchable.