This is simply insanity. The USSR didn't let its support for Communist parties throughout the world stand in the way of diplomatic relations with capitalist nations (which of course meant every nation in the world other than the USSR).
And a major goal of Hitler's diplomacy in the 1930's was to persuade British Conservatives that they should support him as a "bulwark against Bolshevism" and accept a dominant role for Germany on the Continent in return for Germany supporting the British Empire. Why on earth sacrifice this prospect for support of a tiny group very unlikely to come to power? And actually
recognizing that group as the government of Great Britain?! Or who should he recognize as the government of the US--the German-American Bund?! I think the German army would conclude that Hitler had gone crazy and would overthrow him.
Indeed, even in nations where Nazi-like movements were stronger than in the UK or US, Hitler preferred to work with existing pro-German "conservative" governments, putting
Realpolitik over ideology. As John Lukacs notes in
The Hitler of History:
"All over Europe (for example, in Holland, Denmark, France, Romania, and in a few remarkable instances even in Austria), local National Socialist leaders were abashed when they found that Hitler did not support them and paid them hardly any interest at all. He preferred to work with the established pro-German governments of such provinces and states. The most telling example of this occurred in Romania in January 1941. There the National Socialist and populist Iron Guard (whose anti-Semitic ideology and practices were perhaps the most fanatic and radical in all Europe) got into conflict with the nationalist and military government of General Antonescu, whom Hitler respected and liked. When in January 1941 fighting broke out between the Antonescu and Iron Guard forces, the Germans unequivocally supported the former at the expense of the latter, on occasion with German armor and tanks.
"Of course he had his reasons. While the war lasted, he needed order in the countries that were his allies or satellites--a kind of stability that must not be endangered by revolutionary experiments, and that assured undisrupted deliveries of necessary material supplies to the Reich. Thus he put up for a long time with allied chiefs of state—a Petain, an Antonescu, Regent Horthy of Hungary, King Boris of Bulgaria—some of whom he knew were not wholly loyal or unconditional adherents of a National Socialist Germany. Still, it is significant that he did not offer the slightest promise or give the slightest indication to the effect that sooner or later, perhaps after the war, his foreign National Socialist followers would get their rewards.* [FN] He would, of course, recognize and support some of them in 1944, when his former satellites or junior parmers deserted him; but that was no longer important."
https://books.google.com/books?id=oRwJs6qCMvIC&pg=PA162#