That I couldn't say. This map is sort of a seed for an idea I have for a TL, but sadly I am having trouble finding information about interwar Italy (especially pre-Mussolini, so between 1919-1922) and interwar France. That is a weak point in the map, sadly.
I get it, I just find butterflying the Fascists completely would be amiss. I do agree though, without D'Annunzio's antics the Fascists wouldn't have the ability to form a coherent movement capable of actual action. Hell IOTL Mussolini basically bluffed his way into power, it's not impossible to think that the powers that be would hold the Fascist down without problem.
While without Mussolini's example, it's true they won't attempt per se a march on Rome at some point the hotbead of reactionary, fascist, ultra-nationalist and anti-Semitic that Munich was was going to explode one way or another and Hitler was just too darn charismatic and good at rhetorical speech as not to win over the DAP. Also, even if he does not try to march on Berlin by November 8th 1923, the situation of Bavaria being practically in open revolt against the Reich was not all that linked and I think Hitler, who was not just yet good at waiting, would have gone ahead nonetheless. Plus he still had the support of Ludendorff.
Umm, your solution also seems possible. The idea of the ban came from A.J. Nicholls's Weimar and the Rise of Hitler and well he mentioned that a Prussian court would have been most likely to ban him than a Bavarian one. But my idea was simply to get rid of him.
I agree that the situation in Bavaria is to flammable not to ignite, however I disagree with the assertion that with the POD that occurs, the Beer Hall Putsch would occur as OTL. While the Nazis and Hitler would be a dominant to middling power in Bavaria, without the March on Rome, I could see the more reactionary elements taking the day, Bavarian separatism was quite large at the time, as well as those who supported restoring the Wittelsbach family to the throne of Bavaria.
Another possibility could be for Von Kahr to be more witty when talking with Hitler. Now he was an arrogant son of a bitch, but if if Seisser or Lossow could have intruded, or convinced him of the tactics superiority, they could have promised to "aid the National Socialist revolution of Germany" by ordering the regiments of the Reichswehr and the Bavarian State Police to begin the march on Berlin to restore a true nationalist government. Only, when the troops actually come out, they are fully aware of their superiors intentions, and massacre the Nazis assembled mass. Hitler and a whole lot of Nazis would die, before anything could happen. Then, if you wanted to expand on the fall of far right politics in Germany, the Bavarian government could actually attempt to secede and get crushed by the actual Reichswehr. However that might cause a civil war.
But if you keep the Beer Hall Putsch, banning him from taking an active role in politics would likely kill the Nazi's as we know them. I know I sound like I work for a Strasserist lobby, but seriously, Gregor Strasser had serious traction and you could see the Rhine and Northeast Germany become the Nazi heartland with a bit more red. But obviously Im big on Strasser.
Obviously, this is just my take and any timeline is up to you in the content area. I like the map, just had some problems with the TL background.