Originally posted by Peter Ebbesen
Give the Union of Kalmar CB shields on all of Scandinavia and a couple of nasty events ala the Engelbrekt rebellion.
In case of the end of the Union let Denmark retain CB shields on Sweden and Norway.
Remove the CB shields on Sweden around 1600 if Sweden is in existence and not a Danish vassal: the secession from the union succeeded.
It will make a Kalmar Union that survives, and a Denmark that manages to quash the secessionist Swedes strong - which is as it should be.