I'm sure something like this has been done before, but how might we get an Austro-Prussian War that ends up with both sides basically end up where they started? Or at least just a much less devastating loss for Austria? What I'd like to see in the end is some sort of Austrian-run German Confederation in the south and a smaller German Empire in the north, both of which are lasting, cohesive entities. Anybody up for the challenge?
Earliest POD is 1800.