I assume you're going for a united Austria-Bavaria without Hungary? In which case, Hapsburg's POD would do the trick-the Bavarian claims Austria were based on Maria Theresa being ineligible under Salic Law, which didn't exist in Hungary. (Frederick the Great, who refused to accept Maria Theresa's claims to Austria as legitimate, still refered to her as "Queen of Hungary", since this was the one title she indisputably held) So, if the Bavarians/French/Prussians completely conquer Austria so Bavaria can annex it, then its quite possible for Maria Theresa to still be left ruling an independent Kingdom of Hungary. This would allow Wittelsbach Austria/Bavaria (Austria has the more prestigious title, and the capital will almost certainly be in Vienna) to focus on Germany, and will probably help the Ottomans out greatly, since just plain Hungary is much less intimidating than Austria-Hungary. Heck, if you want to achieve an "Austria unites Germany" scenario, this strikes me as a good POD.