I would like to insert a pop-up widget that is visible on all pages for all applications in the backoffice for each ISV zone. See image below for an example of this widget.

How can I set this up one time per zone for all ISV zones? The only method I can find is the application header/footer or application custom sidebar. This has to be done on a per application basis. We have about 30 zones with at least 10 applications per zone (sometimes 3x that many) which means I would have to make this change in at least 300 places. 

Does anyone know how I can surface this widget via one setting per ISV zone? Custom shared.properties setting on the server?

Thank you,