As we all know, making the German and Italian unifications more successful than IOTL is actually not that difficult. With a few appropriate PoDs and butterflies in 1848-49 or 1866-71, Germany may easily find itself with Austria, Bohemia-Moravia, all of Alsace and Lorraine, Luxemburg, and Slovenia, whileas Italy may find itself with Trento, South Tyrol, Gorizia-Gradisca, Istria, Dalmatia, Slovenia, Nice, Savoy, the Riviera, and Corsica. Been there, written or read TLs about it.
No, what I'm interested in here is how the German and Italian unifications could be plausibly wanked to include even more "Germanic" or "Latin" stuff or historical/geopolitical/irredentist claims, than the above list, respectively. The list is not exclusive but any means, but say any of Netherlands, Flanders, Denmark, Lodz area in Poland, or German Switzerland, for Germany, or Malta, Italian Switzerland, the Rhone area, the Balearic islands, Albania, or Montenegro, for Italy.