I've seen somewhere a type of strap that goes around your neck like a necklace, hangs down your front between you and the back of the guitar, and then comes up around the waist of the instrument and, with a small vinyl-coated hook, hooks into the sound hole. This must support the guitar and allow it to pivot to the angle that works best for you (however, you can't let the guitar hang in the strap without your hands on it, since it's supported only by the one point).