The idea that Trotsky charges the Red Army headlong into the guns of the rest of Europe because.. he's an inept ideologue? I don't really buy that, he managed the Red Army during the Civil War and will likely be aware of its strengths and weaknesses. I strongly doubt he will "invade Germany" outright with no grand strategic plan - far more likely is the smuggling of arms and equipment to various leftist organizations within the Weimar Republic. I do think he will array some sort of coalition of countries against him, but "the Red hordes pouring into Europe under Lev Bronstein" the first chance he gets is a tired alternate history trope.
So, no alternate WW2? I mean, if he's selling Mosin-Nagants to the Germans, wouldn't that set the stage for a German Civil War between the KPD, the Nazis and Weimar loyalists?