Remove the wings and then remove the aluminium cover to the wing electrical connector. I think there has been a plan change at some point but if you have blue electrical plugs for the wings there are 4 screws in the seat floor that hold it in place. Remove them and slide the connector out. You then have quite good access to the headset jacks.
It sounds like a lot of work but shouldn't be more than 20 minutes.
Recently had to get to headphone wiring on my 12. Pulled wing pins, pulled the wing in question out a foot or so with cushioned stand supporting wing tip. Removed screws on cover plate at wing root. Easy to do and good access.