Right, I see your point. Well, lets line the ducks up and see which ones get shot down ITTL.
1. Italy is already in Albania and significant portions of his army are in place. The possible next moves for these divisions is Yugoslavia, Greece or redeployment.
2. Mussolini considers SE Europe as within the Italian sphere. Particularly the sphere is rhetoricised (such a word?) as a second Roman Empire, and such an empire certainly includes Greece.
3. Mussolini is pissed at Hitler for continually not revealing his moves; the occupation of Romania in particular. He want's to get his own back in similar coin.
4. OTL Italy issues the order to invade Greece, without telling Hitler, mid Oct. However Mussolini is looking seriously at attacking Greece by July and Italy embarks on a provocation campaign that culiminates in Aug by the sinking of the Greek cruiser Elli.
For (1) the choice is attack or redeploy. Taken at face value Yugoslavia is similar to Greece... except the armies bigger, as is the country. Probably not the best choice for a bully. So it's either attack Greece or redeploy (to Africa).
(2). It is difficult to see how Fascist Imperial ideology can do an about-face on Greece without losing, um, face. You could POD it such that Italy views itself more as a Med/North African power, which certainly is feasible, but is also another POD.
(3). Mussolini declared he wanted Hitler to learn about the invasion of Greece 'in the papers', which demonstrates his petulance and egoism on the matter of continually being treated like the kid brother. He want's success, but he also want's surprise. So he needs to deliver a bolt from the blue. He could attack Spain

Yugoslavia, Greece, Turkey or the Vichy. Turkey, Spain and Vichy are politically sensitive, and just off the menu really. As above, Yugoslavia is probably too much to take on, so a surprise attack means Greece.
(4). Mussolini will need a mucho grande victory to go cold on the idea of attacking Greece. He will need it, not in October when his divisions cross the border, but in July when his thinking starts to dwell increasingly on the invasion. ITTL by July Tenth Army is in possession of Sollum and, having been harrassed by the British all the way from Halfaya Pass, is only now aproaching Sidi Barrani.
By my analysis Greece is the only thing on the menu, unless you POD the strategic focus from SE Europe to N-NE Africa (which is certainly in keeping with the general thrust of the TL, where subgrade Libyan oil is starting to be worked and the Commando Supremo is showing itself as a more rational beast. But taking on Africa means taking on Britain... and if Italy quails as Yugoslavia, it will quail at Britain. Notwithstanding that Italo-British ties in the interwar years were warm.
Croesus