Joking apart. Will is onto something. I know a few guitarists with arm or hand injury. A mate who only ever strummed chords anyway has carpel tunnel syndrome and yeah, it would get him back up to floor spots.

Of course. Much smaller electric versions already exist.

Related, I have a string stretcher which allows me in and out of drop D without retuning, which if nothing else spares the audience my corny jokes whilst pratting about....