IRL, the Savoia-Aosta and Savoia-Carignano branches of the House of Savoy were (and still are, even though Italy isn't a monarchy anymore) somewhat at odds with each other; the same can be said about Benito Mussolini and Gabriele D'Annunzio, to such an extent that the former was
paranoid about the latter staging a coup against him: in 1922, shortly before the March on Rome, the poet almost died after a suspicious "accident" and, after the PNF murdered Socialist PM Giacomo Matteotti, the Fascist regime acconsented to D'Annunzio's every decadent whim, in order to keep him in a gilded cage, as they knew very well that the
Vate had supporters on both sides of the political spectrum - even his own ideals, embodied by Fiume's
Charter of Carnaro, were a rather unique blend of anarcho-socialism and nationalism.
IRL, both D'Annunzio and the Savoia-Aosta either went along with or were neutered by the Fascist regime and the main branch of the royal house, respectively; but what if Prince Aimone, Duke of Aosta and eventual King of the Independent State of Croatia, as well as Gabriele D'Annunzio, owing to slightly different events taking place before, during and after the rise of the PNF, had been able to depose both Benito Mussolini and Victor Emmanuel III in 1924? As the Fascist Party owed a
lot to D'Annunzio, I doubt the poet would've banned it - I think he would've taken over the party, while returning it to its quasi-socialist roots, maybe even replacing the
Statuto Albertino with a
Charter of Carnaro updated to apply to the whole of Italy, before dying of old age in 1938.