I have this idea of a 'Most Personal Device', which is this little computer you always have with you, never leave it out of your sight, and use it as an authenticator and recovery seed for everything else.
I've bought Pebble time steel smartwatches with the idea, that I'll try to program them. This didn't go well for several reasons.
Could you get an edge in custom-made interactive environment (think ￼SelfLang or Smalltalk) by using all kinds of alternative physical interface?
Just several pictures of Yurtas with satellite connection, solar panels and maybe wind power generator.
Article about the philosophy of custom made computers without displays, usually known as decks.