I want the military orders to be somewhat expanded. Not just knights and their foot soldiers. They often had several tiers of units.

The heaviest possible knights for Denmark too. The knights were in absolute control in Denmark and after the initial backwardness they caught up and became very well armed in gothic armour and the like.

Landsknechts would be a nice period determined mercenary unit, perhaps also recruitable for the HRE? Should also have a few tiers.

Wendic raiders/warriors. Light infantry found on the northern coast of Germany (Baltic side) and Poland. Fast and speararmed. Pointy helmet but no armour and a large round shield... Come to think of it, they would be pretty generic. But their defensive value would be good, and they would be cheap. Merc and rebel only.
Add in Wendic nobles, and then you get a swordarmed version with a little armour as well.

Flemish Militia! We can't leave them out. Spear infantry with AP (since we can't have a true mix of weapons). Fairly heavy armour.