Perhaps ITTL, Italy only trades Savoy and keeps Nice, doesn't really matter just that for some reason, Nice continues to be a part of Italy. In the Congress of Vienna, Monaco regained independence from France, but as a protectorate of Sardinia. IOTL, when Nice was transferred to France, Monaco became a French protectorate, but soon declared independence, hoping for Sardinian annexation.
If Nice was to remain a part of Italy, what could be expected? Might Italy eventually annex their protectorate, or would it continue to exist in a similar manner to OTL?