On the topic of Fascism "working" ITTL.
All the military might, glowing glory of victory, international rise from strength to strength ultimately does relatively little to address the underlying problems of the Fascist system.
It actually makes things worse on the longer term by forcing Italy to pour a lot of resources into the military, colonial policing into far away lands which will produce little revenue in return (and would need considerable investment to increase that, which Italy would have trouble to scrape together), and the propping up of subordinate allies such as Greece or Croatia (as opposed to domestic investment into productive stuff). This will cause some issues similar to what the late Soviet Union experienced IOTL, with an oversized military spending being a dead weight on the economy.
IOTL, the Fascist regime was insanely corrupt. While it wanted to project an image of ruthless efficiency, historically it was ruthlessly inefficient. This is different ITTL since the system is perceived as working, but corruption would still be rampant.
While the world at large is likely to be poorer overall, so Italians will not see the bounty of consumer goods elsewhere comparing as unfavourably to their situation as Soviet citizens did IOTL, at some time the Empire will be show to be something Italy can hardly afford, and cannot renounce either.
At some point, the cracks will start to show, although it may take time for that.
