I live in Germany, and all the flour here is made from soft winter wheat. I can get some durum semolina imported from Italy and sold as "hardwheat flour" (Hartweizenmehl), and that's about it. But most of the ressources on bred baking I read are of American origin, and they are all optimized for American style bread flour, made from the endosperm of spring wheat.
Is there a source within the Schengen zone which produces high-gluten flour and ships it to Germany? I think I read a comment somewhere on the site that Sweden has such flour, so maybe there is a producer who ships to Germany there. But I don't speak Swedish, so I can't research that. But I don't care if it comes from Sweden or another country, as long as I don't have to pay import taxes.
Best Answer
The UK has the right bread making flour in its supermarkets. I'd think that the UK has the closest to American style breads. Though it is outside of the Schengen zone, they do speak English and should be able to send you some. Try some companies such as Graig Farm, Wessex Mill, FWP Matthews or Flourbin.
These websites probably won't list delivery to Germany online however you can try telephoning them and see what other delivery options they have. The Wessexmill does list a retailer in Switzerland with there product.