...the role of the Vrill and Thule societies in his rise to power.

Many books on these secret soceities. I'll link some later. Hitler was tasked by the German army to infiltrate the Thule Society, which had several Jewish members.

shared symbolism between the Nazis, Freemasons, and Theosophic Society (such as a shared reverence for the swastika)

Yes and no; relationship of symbology doesn't always mean one and the same. He very well could have been hijacking these movements for his own political gain. He liquidated Freemasonry except for the Prussian lodges which remained antisemitic, but they too were eventually disbanded.

funding of the Nazis by the American establishment

True. Businesses is business. Warburg or Bush did not fund Hitler.

the assimilation of the Nazis into the American intelligence community and NASA

Their country was destroyed thousands were executed at a nearly all Jewish kangaroo court, and those who had the intelligence or a gift for genius were given a choice, death at Nurmeberg or give us all your technological and political secrets. It definably wasn't a 2 sided deal.

Hitler's disappearance which leaves open the possibility that he escaped, and possibly wasn't personally in danger

Killed himself, his family attests to this.

the fact that the Allied forces deliberately left weapon plants intact, indicating that a hidden power meant for the war to go on for a while.

Based on these facts, I cannot exclude the possibility that Hitler was controlled opposition.

BUT IF YOU WANT TO GO DOWN THIS LINE OF THINKING, cannot do better than this:

18 pages https://fitzinfo.net/forum/topic/hitler-the-kabbalistic-talmudic-creation-of-ww2/