Don't know why but I'm imagining Vader redubbed by Arnold Schwarzenegger would be hilarious. The possibilities are endless with his films and abundance of one liners. It would be like the producers of Batman and Robin had made Star Wars lol
"Commander tear this ship apart, find those passengers, I want them alive"
becomes
"Crush your enemies, see them driven before you and hear the lamentation of the women" (Conan The Barbarian)
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With David Prowse's size it's believable that Arnie would be the guy in the suit.