Years and years ago, I said Arnold Vosloo would've been an amazing Lex Luthor, but the subject of Blofeld coming up, why couldn't a South African play Blofeld?
He's in his early 50's, he's got sort of that Telly Savalas/Yul Brynner thing going on. He's got an interesting voice, that just fits the intellectual bad guy. He's also had the ability to get in shape for a role, so he could be a fighting Blofeld like Telly.
https://www.youtube.com/watch?v=riq_1avVozE