Custom Sidebars Pro Location

We have a complex News site that hosts University News and Individual Unit News sections. We need to be able to assign sidebars to sections of Pages and Posts for units. However, we can't use categories because we don't want the Individual Unit Category to show up in the list of categories on University level news listings and some posts are displayed in both places. So, is it possible to set the Sidebar Location by a tag or custom taxonomy? We also really don't want to have to custom code the location of each sidebar.