Obviously you would only support white reproduction. Yes but the fact is that white genetics are flagging in Europe. Men are gradually becoming more and more effeminate, and women less and less maternal. Numerous traits are becoming scarce (for example the classic powerful jawline).     Being able to choose what genes get used, means that you can mix and match and boost certain traits any way you please. You could probably ensure that the next generation will have a mean IQ north of 120. This would make the children you produce a dominant force in the job market, able to return large sums of money to the repopulation centers once they grew old enough to work. They would also have the resources to have plenty of their own kids, perhaps 4 or 5 per family.     If you educated them properly with love of their own people, love of their country, and most importantly love of big families, they will multiply on their own after the first generation.