Is there a POD that gives Switzerland sea access ?

If this were to happen - which it wouldn't for the following reason - then all neighbouring states would believe it to be so much the farce that it would be that they would start pushing their luck immediately. If the city didn't try to vote itself immediately out of the Swiss orbit - after all, what can the Swiss do? Glare menacingly across the entire breadth of Italy? - then you can be sure that Austria, Italy or some such would rapidly try to arrange a plebiscite having Fiume annexed to themselves. Ideas of the Swiss being given a mandate are insane.
Not necessarily.
Italy would not annex until Nitti/Giolitti were in charge, since it was considered a trade token to have wheat supplies from the USA at a lowered price.
Jugoslavia would not dare to move without the french support, and the french at that point would not trust them to be able to keep it (again , D'Annunzio mess).
The population tried that in 1920-21, in order to declare Fiume's annexion to the italian kingdom.
And it ended in a year economic blockade enforced by the italian army (=famine) and being shelled by the very same italian Navy until the city was forced to accept its independence again.
Austria was really not in condition to make any move in 1921.
 
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