As an opposite example where none of these policies were used afaik and a small population was able to assimilate large amount of people. That's is the Magyarization of the Pannonian plane which resulted in the creation of a 1.5-2 million big Hungarian population within 3-4 centuries.
Maybe hungarian users can correct me on this, but as far as I know there is no evidence of state mandate magyarization and on the demographic front all sources indicate the original migrant population had a miniscule impact on the population as a whole.
Tinto Maps #9 Carpathia and Balkans Feedback
Hello everybody, and welcome to the map review of one more region: Carpathia and the Balkans! This one has taken a bit to get out, as although it was almost finished a few weeks ago, we needed to double-check and correct some issues. This area...
The first chapter(s) can shed some light on this question.