Also consider voice activation. My husband clicks on the little microphone on his iPhone and iPad and sends emails and texts that way. He talks and it types! Example: Hi, So&So period new line -- you have to say "period" or "question mark" or "new line" -- it's not perfect but he has functioned this way for many years and sends a ton of emails!

I’m using my Apple Watch a lot. May seem impractical but the voice recognition is much better than on the iPhone