Worth a look:
www.bills-bunker.de* (It apparently won't link direct to the article on the BFC, just enter and it's about 1/3rd of the way down the left menu)
Some interesting stuff on allied nationals serving in the SS too.
I was once in email contact with the daughter of one hyphenated 'gent' mentioned in the above site (she runs a WW2 related site but I can't think of the name of it). Having no illusions about the character of her father she said one of the biggest problems with researching them was that they were near all of a certain shady type to begin with, and it was thus hard to believe anything they said about
any subject.
Cheers,
Adam.