Ally with Sweden day 1. This means that when one of you starts an independence war against Denmark, both of you and all your other supporters will join too. In the independence war you can grab a fair chunk of Danish land (just make sure you also demand your independence). I like to take some of their mainland provinces, at least enough to get Danish as an accepted culture. After that, Sweden is very quickly going to turn hostile. You're going to need a good general to beat Sweden's army. You should also build up a force of galleys to block the sound from Sweden's allies (such as Poland). In addition, try to ally Muscovy. Take as much of Sweden as you can in the first war, though you might not get enough to make Swedish accepted until later. After this, you're basically as strong as an independent Sweden, so do what you like.
For your first idea group, consider quantity. Your default manpower is awful.
For your first idea group, consider quantity. Your default manpower is awful.
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