With all due respect, Jack Campin, the standard hurdy gurdy uses the left hand to play the keyboard and the right hand to turn the wheel. (So a simple left-handed hurdy gurdy might do, though even then the left hand would have to turn the wheel in an even, regular manner). But in a "proper" h-g, the hand turning the wheel has the complicated job of providing the rhythm, via a hand that regularly gives an extra push to the wheel and a sympathetic vibrating bridge on one of the strings that translates that into a rattling, buzzing sound. That is the fancy stuff that needs the really delicate touch on the wheel. (I know what I'm talking about, but I haven't been practicing enough).

Not something I would recommend in this instance.

A one-handed keyboard can still be polyphonic and presents lots of possibilities. Especially if you used to play one.

Good luck with whatever you try, shoutjoy.