I was literally just thinking this today.
What I have done at work, when I type the most, is have my phone plugged into the power, put a stream of some game on there, and just prop it up, half on the desk and half on the case of my keyboard, that way I don't want to rest my wrists on my phone. However I am the only person I know who hits their spacebar with their index finger, so that might be a bit harder for normal people who use their thumbs.
But it seems to work for me.