You can build your own search screen where the search command is a separate entity, often linked to the current user, every user has one search command object.
Filters are attributes of the search command entity.
The results are associated to the search command with a reference set. In the search button microflow do a retrieve with any filters you like and connect them to the search command object, refresh the object to show it on the screen.
Don't forget to disconnect excluded countries the second time searching.
Optionally add a details button to open the country and see the details.