Fear and trembling because of the very real prospect of being misunderstood. But a foray it must be, since present realities in Western Europe and the Anglosphere will eventually compel the Church to open up a frank and serious, which is to say platitude-free, discussion about it.
First, from an Orthodox perspective, and as Anglicanism like Orthodoxy is organized along national lines, of special interest to us: Orthodox Ethno-Theology and the Forced Demographic Replacement of Eastern Europe;
Next, a better-quality article written from a Reformed perspective: A Biblical Defense of Ethno-Nationalism;
Lastly, an excellent cautionary article from Aaron Wolf at Chronicles magazine: Incidentally White.
Is there a "biblical doctrine of nations"? The platitudinous, politically correct answer is "no". Since I've so described the "no" answer, you'll know what my answer is. If I'm right, it's time we start talking about it. By my lights, it is eminently possible to answer "yes" and not commit oneself to a racist position.