In a sense, much of Eastern is ahead of the curve with this. As the government there knows this, they tend to import Filipinos, Nepalis, Indians, and sometimes even Brazilians. It’s usually females in tourism related jobs, and then the males slowly pour into delivery/construction
Anti-immigration rhetoric grounded solely in migrants' propensity for violence and crime, rather than direct appeals to racial hierarchy, will backfire in the long run, since there are plenty of docile slave-subraces available for the modern gerontostate to import