One of the concessions Italy had to make to switch IOTL was to cede the Venezia-Giulia region to Yugoslavia,
Is there any chance that Italy would keep its pre-war border with Yugoslavia, and more or less set in stone with a smaller version of the Polish-Ukrainian population exchanges?
Another possibility is a regional autonomy arrangement along the lines of the Gruber-De Gasperi Agreement which afforded German-speakers in South Tyrol autonomous status. This seems agreement has worked reasonably well for the German-speakers' demands, but it's an exception to Europe's post-1945 "deport them to the 'right' side of the border approach" to minority issues.
The only reason the South Tyrol autonomy agreement probably happened OTL was because the alternative would be a German state (Austria) "gaining" land after WW2.
Were there enough German troops in Italy to present before the start of Sicilian campaign to occupy the whole country ?First of all, assuming the King escaped to Sardinia to make such a proclamation, the Nazis will probably end up occupying almost all of the Italian mainland and Sicily, instead of only the Mainland. This would likely make any Allied invasion of Italy a little bit harder.
Can you substantiate that? AFAIK the modern border was just due to where the boots ended up being at the end of the War, but there was no preemptive declaration (not to mention that one would have been hugely devastating for the Italian Resistance).
Were there enough German troops in Italy to present before the start of Sicilian campaign to occupy the whole country ?
Another question is if the Italians have the will to close the Alpine passes to German reinforcements, and cut fuel, food, and land communications to the German forces inside Italy.
Can't really find any materials online right now, but I went to museums in both Ljubljana and Trieste, and they both had WWII sections which mentioned that, at the very least, the former Austrian Littoral was supposed to be ceded to Yugoslavia.
Not really. There were some troops around since May, but the bulk of the divisions were added after the fall of Mussolini, and their positioning was also fixed for occupation in August.Were there enough German troops in Italy to present before the start of Sicilian campaign to occupy the whole country ?