Diabolik did have a short run translated into English but wasn't a success. I'm afraid.
As I think a bit more about Sadistik, I remember seeing some issues of a French photo digest in Fantasmak in Paris - he specialises in digests - but I can't for the life of me remember what it was, apart from the skeleton costume. Couldn't have bought any anyway as I'd already handed over all my cash for other obscure delights. Those were the days before cards.
Found the reference and Sadistik was/is a reprint of Kilink

What a great skeleton suit, almost up the standard of Kriminal