Pardon my question... you did loosen the bolt that holds them in the bar?
No pardon required. It's a reasonable question, and the answer is "Of course." I have completely removed the shell and slipped the bolt around the bar and out the other end. The other end was clear because the lever on that side came out easily. On this one they are just plain stuck.
So what about stuck derailleur cable ends??? That's a bigger problem. I struggled with one before and finally gave up.