I use a clip on shoulder strap from some old luggage to carry my DLSR to the boat. I put that inside the port cover on the camera table along with a a two pound weight. It's always there when I get back. If I forget and the camera is handed to me with the cover on, I put it in my wife's BC pocket.
How do you deal with the cap when diving? Do you take it off before entering the water? Or try to put it in your BC pocket like I did?