WI: Gustav, Duke of Zweibrucken becomes King of Sweden on Charles XII's death?

Gustav Samuel Leopold, Count Palatine of Kleeburg and later Duke of Zweibrucken (AKA this guy: https://en.wikipedia.org/wiki/Gustav,_Duke_of_Zweibrücken) was a paternal cousin of Charles XI and XII of Sweden, and the last male in the Swedish line of descent from Katherine Vasa. IOTL, Charles XII's sister Ulrika Eleanora seized the throne upon his death, then she handed it over to her husband, Frederick of Hesse-Kassel.

With any POD between Ulrika Eleanora's marriage to Frederick of Hesse-Kassel and Charles XII's death in 1718, what if Gustav had somehow managed to become King Gustav III of Sweden? IOTL, by 1718, he was married to Countess Dorothea of Palatine-Veldenz, but they had no children, and when she died in 1723, he married morganatically to Louise Dorothea von Hoffmann, with whom he also had no children.
 
Maybe if he has a son-heir, he looks somewhat better than Ulrika? Although, AFAIK she had her last miscarriage/stillbirth in 1722/1724. Maybe the Swedes see him as a better horse to back. But he's gonna have to tiptoe very carefully. Ulrika promised all sorts of concessions to them naming her queen over her nephew in Holstein, which ushered in the Swedish 'age of liberty'. Gustav's going to have to come across as a competent soldier, but a peacemaker (he'll have to either promise to be the anti-Carl XII or that he'll save Sweden from losing her empire or that he'll regain her empire for her); absolute but open to ideas. Görtz was mostly despised by that time, so IDK how much impact getting him onside might have.
 
Reducing royal power is probably a given after C12's death. Not squabbling away the peace negociations is not given, so say Sweden gives Narva and Viborg and inbetween to Russia, but gets to keep Estonia and Livonia, and Russia accepts a Swedish Courland. This might avoid the 1741-43 war, and also avoid the 1719 harrowing of the Stockholm Archipelago.

As he had no heirs, then succession problems might be like OTL's.
 
Reducing royal power is probably a given after C12's death. Not squabbling away the peace negociations is not given, so say Sweden gives Narva and Viborg and inbetween to Russia, but gets to keep Estonia and Livonia, and Russia accepts a Swedish Courland. This might avoid the 1741-43 war, and also avoid the 1719 harrowing of the Stockholm Archipelago.

As he had no heirs, then succession problems might be like OTL's.

In 1724 as the king of Sweden, I would imagine he'd be seen as a better catch than as a mere pfalzgraf of Zweibrucken.
 
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