So for a Footprintverse TNO(Which could have POD as Germany not attacking Italy, which remains neutral, and the Fascist blocs diverging post war), I think it would be genuinely grimdark, especially from a leftist POV. Now there have been some irate and sectarian people on the left that claims that TNO is grimdark but I feel that it's neatly contrasted by Sablin and the good USSR unifiers, as well as by demsocs and even socdems like Wilson, Harrington and likely Tommy Douglas. In Footprint verse, Socialism as good guys will be a hard sell, and a shitton of socialists will have focuses to go full Serov on the Jews and other minorities. Sablin and Bukharina might only be marginally better than the tankies in the room and Sablin's route may be torn between authsoc route from OTL!TNO vs. a Nazbolish route. Libsoc might not even exist as an ideology and the closest we get to Libsoc is Malenkov Divine Mandate and maybe SBA.
What's more scary is that Speer, Matovsky and Shaf be written as good guys. And Speer and Matovsky's conflict with G4/Petlin respectively be more shades of grey than Speer and Matovsky clearly being in the wrong. I'd also imagine monarchy being immune from criticism and as a result, we might not get Taboritsky as the worst Russian unifier and they would use Diky as originally planned for that role. Also the Mikhail vs. White Army conflict would be framed in grey morality terms rather than the army being in the wrong. In fact, I could see Himmler holding his nose and use one of the democratic or commie unifiers as his pawn.
Expect Zhadanov to fake a mars landing.
There's also going to be a sane Mosleyite fash path for Britain, and Birch will start a British Holocaust along with Chesterson and go literal INGSOC.
Also all of the Pan Arabists would be natsoc if the Italian Empire collapses with 1-2 ultranats.
US politics would be more cursed and Hall might be more genuinely tyrannical maniac who is indistinguishable from Yockey in having a hate on for Jews, rather than a well-intentioned misguided idiot we get in OTL!TNO plus the added bonus of calling Henry Wallace the second greatest revolutionary in American history after Lincoln.
A leaked presidents list from way back I was aware of for some time but is no longer accurate(a lot of people on there like Reagan and Chomsky got the axe) had NPPY Larouche in the portrait files, and he might be an option here, but the sane Italian inspired option for NPPY.