I read not so much time ago an italian sf novel about a Mussolini who migrate in the Usa soon after WW1, and after a while become a successfull adventurous and humorous sf writer:
http://www.robinedizioni.it/il-fascio-sulle-stelle-di-benito-mussolini
I don't think it was translated in other languages than italian, anyway.
the novel is on a very light register and it simulate an anthology of the now old and respected writer with some comments and anecdotes between a tale and another. is a sort of parallel with Spinrad's Iron Dream, but on a very lightful tone. Mussolini and Hitler become friends, but there's a lot of difference between them and their readers, Mussolini solar, optimistic and womanizer, a successful immigrant enthusiast of the american way, Hitler goth and oscure. they become friends as coleagues but have a lot of arguments., Mussolini calls him "mad hun"...
all this to say that a POD (that I guess is not what you had in mind) could be that when Mussolini and his camarades arrive in Rome, King Vittorio Emanuele III and his ministries find a bit of courage and just arrest them all (the most important).
but Mussolini is too popular to just be leaved in prison or sent back, the institutions fear a serious revolt, so they propose him esiliation for some years. maybe as some sort of ambassador or cultural affairs attache. same for other prominent fascist bosses, that are sent around the world (Australia, New Zealand...), but not in countries where they could find support and proselitism (Japan and Germany).
after all life as ambassador is a lot better than as revolutionary. they make friends with some important people, the italian expatriate community give some sort of support, and they indirectly inspirate someone else on doing a fascist revolution.