I use Variax guitars to do "the Keith Richards thing".
With a Variax, you can set the low string to *mute* which is effectively like removing it. The other strings remain at standard tension, but the firmware in the Variax guitar allows you to set them to Open G. And since it's a modeling guitar, you can select one of the Tele models and you're good to go.
All of this can be set up beforehand in the computer and you can simply switch to it on the guitar *or* you can set it up as one of the user presets on a Helix or HD500X and use a single stomp.
So then do you use standard chord shapes, or do you use the chord shapes normally associated with the open G tuning?
I find this very interesting...I'd love the opportunity to try one of those guitars!