‘virtual’ replacement for home button

The home button on my iPad Pro (new 7/2016) has become undependable. Since I use a smart keyboard, I try to use cmd-H as much as possible, but it doesn’t work everywhere. When I’m away from the keyboard, I’m SOL.

Is there any way to define a keystroke / screen tap combo as a virtual home button?
The emergency is over. It turned out I was 5 (!) days from expiration of AppleCare. Apple didn’t repair the button, they returned a new (to me) iPad. That was money well spent.

Have you checked Settings>General>Accessibility ?
I have now. Were you referencing ‘assistice touch’? I’m playing with it now. It works for me. Thanks!