Has there yet been a case of a Jedi joining the Empire willingly?

And I'm not talking some psycho Jedi corrupted by the dark side who just got to live out their murderous fantasies once the Empire took over.

I mean a Jedi who survived Order 66, became disenfranchised with the former Order and ongoing Rebellion, and decided, "You know what, maybe the Empire isn't so bad?"

I am looking to see if such examples exist in canon or legends. If not... well boy, do I have a neat story idea. Do not steal. :B