One Page Checkout + Klarna - Joomla VirtueMart

Hi, We use VirtueMart 1.1.6 + the latest Klarna VirtueMart module. The integration went well and Klarna is working. Klarna is shown based on the customers country. It will only show up (in payment methods) if someone comes from in example United States. Since we use a One Page Checkout Klarna isnt showing up because it only recognizes the country after refresh. When we split up the process in 4 individual steps Klarna IS showing up because the country is read before the module shows up. BUT we want to use the One Page Checkout, so I guess the country have to be called by an Ajax script or something so the module will appear. Who can do this? On very short term?