Blasting "Pure Holocaust" and "Antichrist" on my way to work, sticking to the classics.
Also, having spent a fair amount of time in Scandinavia and passed through Belgium as well, I don't see how Belgium would inspire anyone to play black metal. I mean, OK, Charleroi is one of the grimmest places on Earth, but not in an Immortal kind of way haha.
Also, I don't know but bands like Profanatica, Absu, Night Conquers Day, Judas Iscariot, Black Funeral, etc, come from various US places and man did/do they rule and took/take their BM seriously.