Comment Harsh reality and possible "solution" (Score 1) 178
OP - you need to understand that except for a very few people who fully adapt to nonstandard input devices, most of the other input devices you might try will do nothing but slow down your work rate. Any benefits you might find from using those devices are just as likely due to the reduced work rate as they are from the design of the devices themselves.
You may want to consider a lifestyle and work habit change. Keep using "comfy" standard input devices while you are on the road, with the obvious and relatively easy steps of using a full size keyboard and mouse (or trackball or whatever irritates your injuries the least). But then take the additional step of incorporating a significantly increased number of work breaks into your routine. And go to the gym (or pool, since some swimming can build muscles and endurance with little or no shock and as much or as little resistance as you want) to build up overall physical conditioning, which can help with the causes of the injury as well as help the body heal faster.
In short, use whatever input devices feel ok, don't go all weird with the input devices, since all you're going to do is slow down your work efficiency anyhow, slow yourself down with more (and more effective) work breaks, and add more physical conditioning to your daily routine.
You'll be surprised at how much less your wrists/forearms hurt if you build up the back, shoulder, and chest muscles enough that your wrists aren't taking all of the strain when you type and use the mouse.