Found this while browsing the JDip files. Uses the same map as normal diplomacy except that Switzerland is passable. The nations and their starting positions are changed as well.
Spain: Fleet Naples, Fleet Spain, Army Portugal
Holy Roman Empire: Fleet Berlin, Army Munich, Army Vienna
Poland: Army Warsaw, Army St. Petersburg, Fleet Sevastapol
Venice: Army Venice, Army Trieste, Fleet Greece
England: Army Liverpool, Fleet London, Fleet Brest
France: Army Paris, Army Marseilles, Fleet Belgium
Turkey: Army Constantinople, Army Ankara, Fleet Bulgaria (nc), Fleet Smyrna
According to the variant description, this new set up leads to far bloodier combat far sooner. One gameplay shift I noticed is that the Bulkan "knot" will be more sorely contested, while easier gains can be found in Northern Europe.