I also wanted to use jacks everywhere so it could be easily removed and serviced if necessary. I hard-wired the power plug (red/black wire with hot glue strain relief) that would connect to the battery pack, and used two jacks for the LED tape feed and the switch connection:

Although both of the jacks appear to be the same, the LED tape one is 2.5mm center and the switch is 2.1mm center, so they cannot be mistakenly interchanged.

The power pack and the project box I used were exactly the same size. Some thin Velcro holds the two boxes together.

And all the works conveniently fit inside the walker's utility pouch: battery pack, lighting controller, and battery charger:

All that was left was to make the button. Again I used some heat shrink to protect the wire & connection, and attached it up by the right side handgrip: