My setup for this is my phone with a B.O.W folding keyboard and chrome remote desktop. I don't have any of the I/O but I can access my main setup from anywhere and don't need to lug around another device that does what my phone can already do.
Second this. I believe the real benefit comes from being able to exercise the extensors instead of the flexors, which helps with remedying an imbalance in tendon strength that leads to tendonitis.