This isn't exactly answering your question, but I thought I'd share this strange gadget the twiddler 3. It's a full keyboard you can hold in one hand and it uses "chords" (think chords on a piano) to achieve a full keyboard with only a few buttons.

Seems you can achieve a typing speed of around 60 wpm with a bit of practice, might make typing a bit easier and it is super mobile unlike a real keyboard.