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why not just make a mod for EUIV, 1836-1920? call it "Europa Universalis IV: Blood and Iron"

Because Victoria is way better at modelling the period.
 
You cannot arbitrarily assign POP sizes and politics into a game of V2 and hope to have it as anything other than a complete disaster. It's the essence of the game. I assume in a CK>EU game, you would simply take over as sovereign of whatever country you were part of.

The converters for EU2 to Vicky weren't a disaster, but they always created a world gone mad because sliders never converted very well over to Vicky's politics. And the conversion of manufactories to Vicky factories created some other issues. Then there was the conversion of existing armies into Vicky armies and the province transfers....

In some cases, POPs and their issues/ideologies were the least of your worries. :)