When you looking for influences of the "whispery Nordic stuff" (?!) you can't discount a decidedly European, as in definitely not US, aesthetic perhaps best encapsulated by recordings of Jan Johannson.
I always see and hear ECM as a very European label, the most European of all Jazz labels and that's not exclusively because of its geographical location. To miss this is I think to misunderstand the label.
Released 1964 but maybe the most ECM of albums