Dale: My son has single handed his C-22 plenty in the Florida Keys, and also on the Chesapeake Bay and around the DelMarVa Peninsula. He clips onto his jackline whenever he sails alone, or when he sails with my young nephew, who we don't think could handle the boat alone. We use the autopilots on our C-22s quite a bit, and know that if you ever fell off of the boat it would go on without you until it ran out of water or battery, which could be a very long time.
I don't have a great photo to show you. He put a stainless steel "U" bolt near the entrance to the companionway, off to the side, so that we don't stub our toes on it so much. One end of the jackline is looped around the mast, and the other end is tied to the "U" bolt. Then he clips onto the jackline with his harness. He can go to the bow and to the stern when clipped on, without ever unclipping.
I attached a few photos that may help a little. I think that I am going to recommend that he go to a little stronger webbing for his jackline after looking at the photos. It looks like he used a piece of 1 inch webbing from one of the little winches that we use to strap our boats to the trailer. I think I'll recommend a little stronger 1 inch webbing to him.
I hope that this helps you, Aldo