SharePoint 2013: Search Center Refinement for multi-hierarchy taxonomy field

First of all, i have already done a lot of Research about my requirement. i also read everything from this very good blog post: http://blogs.technet.com/b/tothesharepoint/archive/2013/02/14/how-to-set-up-a-product-centric-web-site-in-sharepoint-2013.aspx

Now my requirement: i have Setup a Content type “Hotel” (document) with a site column “Country/City”. This column is of type managed metadata. The Terms for this are created on site collection Level and are basically structured like this.

Country
—- Germany
—- Berlin
—- Munich
—- …
—- USA
—- New York
—- Los Angeles
—- …
—- Netherlands
—- Amsterdam
—- …
The Column takes it values from “Country” and is Setup for multiple. That means, the user could upload a document and enter different values in the managed metadata. For example, they could choose “Berlin” and “Munich” but also “Germany” and “Berlin”. Of course i have Setup this as a refinable managed property.

Now Comes my requirement: i have a Enterprise search Center. It is needed to do a Standard search for a keyword only in this document library (which works of course). Now the refinement Panel should Show a selection for the countrys (like Germany) and another one for the cities (like Berlin). The only way to do this which i have found so far is to Setup two instead of one site column (one for countries and one for cities). this is from user perspective not optimal. Now my question: is there any way to accomplish this without real development ?