Turks are spreading a tad to fast into the balkans are they not?
Good to see the Finns and Czechs alive and well. Who's the majority in Osel?
That's still quite a lot of Germans. And look at Aarhus and Esbjerg, it's a lot more there. And these are 100% Danish areas. Even in Slesvig, with a mixed population since before the V2 era, the Germans IRL didn't manage to seriously disrupt the balance over half a century of oppression and a world war.
modifier = {
factor = -20
has_culture_core = yes
}
It's unrealistic. It's not what happened in Northern Schleswig. Nor did it happen much elsewhere - worker/farmer migration was much more limited IRL than you seem to believe, especially within Europe.