Widgets/Multiple Categories plugin

I am looking for a plugin that would allow me to combine widget areas into a single sidebar, based on category.

For example, if a post is Topic 1, the widget area for Topic 1 would appear. If the post Topic 2, the widget area for Topic 2 would appear.

However, if the post is categorized under both Topic 1 and Topic 2, then the plugin would combine Topic 1 and Topic 2 widget areas into a single sidebar.

Does a plugin that like exist?