I feel for you guys who suffer with such pain that it begins to affect your biking. I have arthritic knees that sometimes play up but thankfully have...
Must admit. I had the USB socket fused on the unswitched/always-on side of the fuzeblock so I could charge my phone with the engine off when camping....
no pockets and very little spare space under the seat.
Now I think about it, there's probably a bit of space for DIY small pockets, but probably not...