The code that I posted should be placed on the regular confirm page. It will check the shipping country selected. In the example if the selected country is Alemania then the user will be redirected to confirm2.
It is a very simple check of the posted shipping_country. To test it out you would need to ensure that you select the country listed in the if statement. If there are multiple countries that could trigger this you can either add them to the condition or create new if statements. For the value that I used I based it off of the custom code you implemented earlier.
If you have any further problems with this you can print out the value that is being compared so that you can determine if they are matching or not. To do this you would add in this line of code just after the if statement:
<?php die($_POST["shipping_country"]); ?>