I use a spiral line tether like this. However, since I personally don't like tiny carabiners (they're a PITA to operate with thick three-fingers or drygloves), I've bought a large bolt snap (the same type that's used for rigging stage bottles) and switched the carabiner with it. I had to borrow my wife's sewing machine to fix it properly, though.The bolt snap goes onto my left hip D-ring, the other end of the tether goes on the bottom of my (Nauticam) tray. I've also tied another, standard sized, bolt snap to the top of my rig, and on shore entries it's clipped to my left shoulder D-ring. The whole rig hangs pretty much like a stage bottle.
That works for me.
They sell the ones with the brass bolt snaps, which is what I use on my compact setup (except mine has a clip instead of magnetic clasp). I put the split ring over the ball onto its neck before putting the ball clamp on, thus it comes on and off relatively easily.