How about rebubbing Vader as Johnny 5?

'Short Circuit 2' is one of the 20 greatest films ever made, don't let anybody tell you different.

It would really pay off in RESB when Vader shouts "Your momma was a snowblower!" to Luke during the Duel.

Or perhaps, Vader as Malcolm Tucker from 'The Thick Of It/In The Loop'...

Although aren't these films supposed to kid friendly so maybe not.

Wait, wait, wait... how about Basil Fawlty as Vader. I would die laughing...