My back is bad and have gone short-scale, have a Sandberg Superlight on order (2 year waiting list, aaarrrggh). I`ve also started using a Mono GS1 strap, and heightened it as before had the low-down punk setting which doesn`t help posture.
The combination of a shorter bass with its centre of gravity being more over the core of my body, plus the thicker padded strap and playing the instrument higher up have all made a difference.
I don`t use pedals with screens but if I did I would be in the same position so would be looking at one with a bigger screen or lets say 3 patches where each could be selected like on the Zoom B3, and then just add this on to my copy of the set list so as to know which patch for which songs.