For those who didn't know, there is a way to continue your campaign from EU2 into Victoria. You just need to use this converter.

It converts a save file from EU2 (.eug) into a Victoria save file (.eug). It converts provinces, armies, riches and resources.

With this tool it's now possible to make a campaign that lasts 1000 years, from Crusader Kings (which can export its campaign to EU2) up to Hearts of Iron 2 (which allows to import the campaign from Vic) :)

NOTE: The converted save file (.eug) needs to be put in the "scenarios" folder of Victoria Complete.