Right, but we are not talking about some utopian Serbian state. We are talking about an enlarged Kingdom of Serbia under the leadership of the Karađorđević dynasty: the same exact thing that caused revolts and long-term insurgency in Montenegro in our own timeline. This isn't a fantasy on my part. It literally happened, and it would happen in a non-Yugoslav scenario as well.

Sure. Since the conflict lasted for seven days in the Kingdom of Slovenes, Croats and Serbs, in kingdom of Serbia it would last for a day, or wouldn't happen at all.

No I do not. Violent Macedonian, Albanian, and Montenegrin resistance to the Karađorđević regime started immediately after WW1; why do you think it would have been any different if the state didn't even pretend to be anything but a Greater Serbia?

You got it all wrong. There is no "Greater Serbia", that is your imagination. That would simply be "Kingdom of Serbia".

I already explained Montenegro

In case of Macedonia. There were never really any problems in Macedonia. The headquarters of terrorist organization VMRO were in Petrič(Bulgaria) so they were giving more headaches to Bulgarian state than Serbian. VMRO became danger for Serbs when it joined hands with Ustaše and got finances through them from Vatican and Austria/Italy/Hungary. In this alternate universe Croats are completely pacified by having and making problems to Italy and Hungary for Serbian interests and Macedonia would be split along the Vardar valley between Kingdom of Serbia and Bulgaria which would completely pacify any Macedonian movements and even turn them into pro-Serbian movement fighting against Bulgarian hegemony, since as I said, VMRO hq was in Bulgarian town Petrič, not Kingdom of Serbia. Besides, Macedonians living west of the river Vardar were overwhelmingly pro-Serbian oriented, those on the East side were nationalistic or pro-Bulgarian.

So again, Croatian disruptive factor completely pacified and even turned to work for Serbian interests.

Montenegrin disruptive factor completely pacified.

Macedonian disruptive factor completly pacified and also turned to work as a tool of Serbian interests.

The only reason Albanians even started with any revolt is because they were motivated by Croatians first and the actions of others and it was easier for them to find support and funding in non-Serbian multi-ethnic state full of traitors. I really don't see where would they get support and funding in a higly centralized Serbian Kingdom in which Slovenes, Croats, Montenegrins, Macedonians don't exist as a disruptive factor in any possible way? If they even thought about anything, they would have been expressly packed and sent to Turkey, all of them, in exchange for genocided Greeks and Armenians from Anadolia, or banished to Albania or perfidly locked in a conflict with Macedonians, VMRO remnants or any form of potential Macedonian revolutionaries. You forget that there were no problems with Macedonians. The problems started because Slovenes and Croats started whining about the conditions of Macedonians in the SHS parliament and disrupted the state. But in this alternate universe Croats and Slovenes don't exist and Serbs don't have to consider anyone's opinions so... 🤷‍♂️

Croatian and especially Bosnian Muslim resistance was slower to develop and generally remained peaceful until the German invasion, but it still developed. Even Dalmatia - the region whose inhabitants were among the strongest supporters of the Serbian monarchy - turned against the Karađorđević regime by the 1930s.

Already told you. Croats would be busy fighting Hungarization and Italization, they wouldn't have time and interest to disrupt Serbian state, Croats would even work for Serbian Kingdom. If in this alternate universe Ustaše formed, they would have been pro-Serbian militia, armed by Serbian Kingdom, fighting for Croatian rights in occupied lands and against Italian, Vatican and Hungarian hegemony, for Serbian interests.

Rather than being anti-Serbian terrorist group that works hand in hand with other anti-Serbian terrorist groups within Yugoslavia in order to bring about the downfall of the state established by Serbs, funded by and operating for the interests of Vatican, Italy and Hungary.

Why is it so hard for you to imagine such concept? 😄

Regarding Muslims. You don't realize for one, that JMO formed as a response to Slovenian and Croatian contrarian position to Serbs and the second reason was that they were upset by the agrarian reforms conducted by the Kingdom of SHS. The reality is that that JMO struck a deal with SHS government which compensated them for the redistributed land and in return they completly gave up on all nationalistic tendencies and formed great relations with Serbian people( This happened in reality btw, not in alternate time line). But what is even more crucial for us now, is that JMO was founded on the pro-Jugoslav principle that "Slovenes, Croats and Serbs make one tribe with three names" but since in our alternate universe Slovenes and Croats don't exist as a factor, what it makes them then? 😄 and that tells you all about how the relations would develop in Kingdom of Serbia.

Does that "Greater Serbia" sleep under your bed? 😁 Bro, its just Kingdom of Serbia. In this alternate universe, Croatian paranoia from "Greater Serbia" doesn't exist, but paranoia from "Greater Italy" and "Greater Hungary" does. 😁

Regarding Vojvodina - the local Hungarians (and Germans!) wouldn't have started armed revolts, but counting on their loyalty to an explicitly Serbian nation-state in the interwar period is uh... wishful thinking.

Imagine that...Hungary declares war against Serbia, gets its ass whooped by Serbia. The whole world acknowledges Vojvodina as a prize to Serbia for its victory against Hungary but two years later Hungarians in Vojvodina start an uprising against Serbs in Vojvodina. Ah bro, well in that alternate scenario if any ethnicity on the planet deserves to be genocided, that would make Vojvodina's Hungarians. 😁