According to Rabbi Asher Lopatin, a modern Orthodox rabbi from Chicago, one of the most respected Orthodox figures of the 20th century, Rabbi Ahron Soloveichik, issued the following ruling about admitting non-Jewish children into Jewish schools:
when we set up our community, pluralistic school, (Chicago Jewish Day
School) I asked him if we could admit children of Jewish fathers,
non-Jewish mothers. He said yes! Then his grandson who was there said,
But Zayde, these are “goyim g’murim” [complete non-Jews]! His answer was, So what? You can
teach Torah to goyim as well! And he quoted the S’fornu.
Something for this country's Orthodox authorities to keep in mind, perhaps, re: the JFS case.