Rei, you should totally read Otto Rahn's
Lucifers Court (unless you already have).
My two cents on the topic.
Even though fascism is naturally compatible with some form of esoterism due to its own para-religious undertones, I think this compatibility makes it in turn somewhat
incompatible with mainstream political discourse, which it has to engage in order to gain and maintain respectability.
Back in the day the mainstream was Christian, today it's increasingly secularised, none of these seating too well with the occult. Hitler, being the political player that he was, realised those cultural realities to be reckoned with and lost his patience for esoterica the higher he moved up the ladder - his disrespect for the more mystical musings of Rosenberg is known, and Himmler could pursue his interests with the Ahnenerbe because he was valuable in other roles (still at times iritating Hitler with it), similarly the German Faith Movement was tolerated, but not treated preferentially; In Italy Evola never managed to have much sway either.
Mein Kampf (distancing himself from Ariosophists):
The characteristic of most of these natures is that they abound in old Germanic heroism, that they revel in the dim past, stone axes, spear and shield, but that in natura they are the greatest cowards imaginable. For the same people who wave about old Germanic tin swords carefully imitated, and wear a prepared bearskin with bull's horns covering their bearded heads always preach for the present only the fight with spiritual weapons and flee quickly in sight of every communist blackjack. Posterity will have little cause for glorifying their heroic existence in a new epic. I got to know these people too well not to feel the deepest disgust at this miserable comedy. They make a ridiculous impression on the great masses, and the Jew has every reason to spare these folk comedians, even to prefer them to the true fighters for the coming German State.
My New Order:
National Socialism is not a cult-movement — a movement for worship: it is exclusively a volkisch political doctrine based upon racial principles...We will not allow mystically-minded occult folk with a passion for exploring the secrets of the world beyond to steal into our Movement.
The Far-Right seems to have been the most receptive to kooky stuff before, and especially after, the virile phase of fascism in the West. I doubt that if the fascist proposal hadn't been excluded as one of the possible political alternatives, it would have ever given the attention to the likes of Savitri Devi and Serrano (assuming those would have even appeared on the stage in such circumstances) as it has after the war, with occultist exploration becoming for many a substitute for actual, meaningful politics to channel their energy into.