How about after the 1658 peace Denmark-Norway with aid of England and the Dutch do better in 1659-60 thus getting not only Trondhiems Len and Bornholm back but the Scanians also free themselves with Danish aid
but England and the Dutch have seen the writing on the wall and to support the Danes but not reward them too much and slap the Swedes they create an independent Scania Duchy with a Danish duke??? And stipulate no
Anschluss!!! with Denmark...
...or Sweden...
Could make for some interesting scenario.