Seeing the various weddings of Archduchess Marie-Christine (Mechelen/Malines), Archduke Imre (Washington D.C.), Archduke Christoph (Nancy), Princess Maria Carolina (Florence), Andrea Casiraghi (Monaco/Gstaad), etc. it looks like they feel not limited to borders.
However, for a long time Prince Amedeo was the virtual reserve for the Belgian throne, he is a Prince of Belgium as well and the eldest grandchild of King Albert. I think he will marry in Belgium. But let us await the engagement... first things first.