So in OTL you had Gobineau, Sorel, Action Francaise, and the general fin de siècle as precursors to Fascism. But what if France and Austria had managed to crush Prussia and the Second French Empire had survived and prospered.
So what ideological strains would be able to form proto-*Fascism (ie. some palingenetic nationalism or integral nationalism)? There would likely still be the equivalent of a German language fin de siècle in Prussia with Nietzsche and such. What or who else would be needed and where could *Fascism arise?