There is one other question that I should ask: how does one make Germany have excellent relations with a Yugoslav entity? I was thinking of coming up with a plausible hypothesis for a German Mittleeuropa that includes Yugoslavia.
There are two ways, which don't have to be mutually exclusive.
A) Ideological. A Communist Germany, supporting either a truly Marxist or some sort of Ba'athist-esque dictatorship of revolutionary military officers*, would be natural allies for each other. The Yugoslavs can supply raw materials to Germany's industrial base, and Yugoslavia can gain access to German manufactured goods on a centrally planned socialist basis. As well, if leftist regimes are few and far between, they would be pressed even closer.
B) Patron-Client. Whether through a quasi-Soviet Union or Greater German Empire, a Yugoslav elite could benefit immensely from having a German patron to arm them and provide protection from other powers (Italy, Britain, Turkey, etc). As long as the Germans give them a measure of autonomy and don't interfere (unless asked) in their domestic politics, a Yugoslav government shouldn't have any problem aligning themselves with Germany.
*This is the regime that runs a German-aligned Yugoslavia in a TL I have kicking around my head. Basically it's dominated by Bosnian and Montenegrin officers, who move the capital to Sarajevo, make the country a unitary state, heavily secularize the place, and crush all opposition with an iron fist of German-designed weapons.
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