Adding a pocket to a bag

Oct 24, 2019
Has anyone ever had a back pocket added to a structured bag? So many of them have smooth backs. I have arthritis and having to stop to then open and close a complicated flap to get out my phone or id can take a toll. Some of my bags would be fully functional if they just had a slip pocket on the outside. Who would do this? A cobbler?

I'm not worried about release value, I just want to be able to use my bags sufficiently.