ultrastable

I work as a courier for a gig work company which involves a lot of cycling (on the ebikes they provide) which is starting to give me problems like carpal tunnel & intense stiffness/muscle tension/loss of mobility around the shoulder.

I'm on a low budget (let's say $50 to start although I could maybe go higher), what's the best way to reduce this, bearing in mind there's a limit to what I'm allowed to do to the bikes. Supervisor says bringing in my own saddle is fine so I'd be v grateful for recommendations on that front, as well as anything I can do to reduce the vibrations going up through my hands.

If it's of any relevance, the bikes in question are old ebikes w/ a front suspension fork (not that it seems to do anything) & straight or in some cases v-shaped handlebars. Airless tires too, which I'm guessing aren't helping.. Thanks in advance comrades

I've wall-mounted an ancient Ipad & I I'd like to use it as a dashbord: world clock, calendar + appts, tasks (ideally from Things.app), etc - all the better if it's easily extensible. Any recommendations? It's too slow to use for Yam/AirDisplay & the like. Thanks!