I think Austria would show the least resistance against a merger with Switzerland and Germany - both countries are no candidates for a merger in the original suggestion tho.
Größter Knecht aller Zeiten aka His Excellency aka President for Life aka Field Marshal Al Hadji aka Lord of All the Beasts of the Earth and Fishes of the Seas aka aka Conqueror of the Buzzerbeater Empire in Europe in General and Austria in Particular