You'll need a chisel & hammer to carefully beat them out. Notch them then smack them tangentially to rotate them out. I was thinking an easy-out might do it too, but that's a lot of drilling.
The bolts are designed to shear when installed for some asinine Bavarian reason that's beyond my understanding. You can steal the car with a paperclip and a bent coat hangar, but they're worried about someone dropping the column for maintenance, WTF?