Krushchev didn't try to democratise the Soviet Union. He ended large-scale repression, amnestied most prisoners and criticised some of Stalin's purges. And there was a degree of cultural liberalisation. It remained a one-party dictatorship, though supreme power could no longer be wielded by one man...as shown when the Party oligarchy forced him to step down without murdering anyone.
National Socialism hated democracy. Democracy, to them, was the rule of (Jewish) 'plutocrats', and of lesser beings. It was not only 'inefficient', it violated the law of racial struggle, which to them was perpetual and nature's law, and led to 'degeneracy'. The 'strong' must rule, not the 'ignorant masses'. The 'Führer' is chosen by 'providence', not the ballot box. None of Hitler's potential successors - Göring, Speer, Himmler, Heydrich or any of the dark horse candidates (like one of the prominent Gauleiters such as Erich Koch, who often don't get a lot of attention in AH scenarios) will destroy the system and introduce democracy.
It's also worth noting that Hitler isn't just the 'Stalin' of the regime, he's also their Lenin. Hell, he's more than that. The regime was centred on Hitler. Power flowed from him. The Politburo and Central Committee were rubberstamps under Stalin, but they functioned in theory and the Party could always fall back on Lenin, Marx and 'collective leadership'. NSDAP didn't have any formal decisionmaking organs of that type. When Hitler convened the Reichstag to announce the invasion of Poland, a bunch of MPs couldn't make it in time, so Göring simply had random Party officials fill their seats. The Nazis didn't even repair the hall the Reichstag had originally convened in before it got burnt down in 1933.
The Gauleiters considered themselves responsible to the Führer alone. Hell, the Cabinet had its last meeting in 1938. Nazi bigwigs carved out their own private fiefdoms. No Nazi overlord is going to stand up in the Brown House (the official Party headquarters in Munich) or the irrelevant Reichstag and give a Secret Speech criticising Hitler. It's common in many scenarios to cast Speer as the 'evil, but rational technocrat', but that's based on his post-war myth-making. He came to power as a Party insider, not as an 'apolitical' outsider who happened to build buildings Hitler liked.
The Wehrmacht won't be a 'moderating' force in a Nazi victory. They eagerly signed up for Hitler's war of racial annihilation in the Soviet Union. Their rivalry with the SS was about influence...on the ground Heer and SS units cooperated well during the eastern campaign, and the Heer assisted the SS in its atrocities or committed its own. Sometimes the SS massacred Jews at the army's request. The officers and soldiers who opposed this barbarity and tried to do something about it were a small minority. And as the 'Prussians', who were never anywhere near as 'honourable' as they claimed post-war, get old and are pensioned off, new men will rise in the ranks who made their career under the Nazi regime (it's one of the reasons the 20 July putschists tried to stage a coup under the pretext of 'avenging Hitler's murder at the hand of evil Party hacks', they knew they had little support in the army...and this was when Germany was evidently losing the war and the regime was leading it to collapse).
From my point of view, the best you can hope for is a regime that arbitrarily extends its definition of 'Aryan' and suddenly 'discovers' that say a bunch of 'loyal' Czechs, Ukrainians or Poles are actually lost Aryan brothers. 'Mein Führer, I did it! My Gau is 100% German!' There's precedent for that since it's what Gauleiter Arthur Forster did in West Prussia, much to Himmler's annoyance, and Heydrich considered some Czechs to be 'Germanic' (of course, he wanted to deport the 'racially inferior, and disobedient' ones to Siberia as part of the process of 'Germanising' the Reich Protectorate of Bohemia and Moravia...so yeah). And the regime tones down the murder machine since it will otherwise run out of people to enslave and exploit. It'll still be a horrible, utterly vile regime, and the people it invaded and subjugated aren't suddenly going to forget that, especially since even the less overtly murderous forced assimimilation will be accompanied by cultural genocide and tyranny.
I'll admit, I'm in the camp that doesn't see Nazism as reforming (nor do I see the Nazi empire lasting as long as the OTL Soviet Union or surviving into the next millennia like the PRC). Deterministic? A bit, but it's based on my study of how Nazism worked. Plus it's also a bit deterministic to argue that since the Soviet Union and the PRC reformed, Nazi Germany will, too.
One important thing to keep in mind is that most of Nazi Germany's murderousness was directed against people outside of Germany's borders. The German Jews were a small minority and their size was minuscule by the time the war started. Most of Europe's Jews lived in Poland, hence why the Nazis built the Aktion Reinhardt death camps there. And while Hitler purged his internal opposition in the Nazi movement in 1934, the death toll was tiny compared to the way Stalin purged his Party, military and his own government. By contrast the Soviets under Stalin started their massive bloodletting in their own country. Things got worse for the average 'Aryan' German when things started going downhill in the war and the Nazi Party and the security organs ramped up the terror on the home front and shortages had set in long before that, but the ones who suffered the most were outside its borders.
Now why am I pointing this out? Because this means there won't be the same demand for reform in the Nazi movement. Reforms in the post-Stalin Soviet regime didn't start with Krushchev, though the bigwigs differed about the extent. Not like Malenkov and Krushchev weren't men with blood on their hands. But they had ample reason not to continue the same methods. Ditto with China, where bigwigs had faced the very real threat of being murdered during the Red Guards' rampage. Perpetuating the old system risked destabilising the country and the system.