Hi Sam,
You are right , I don't like the Mexican rigging just their tacos, LOL
I understand your options and since I never hunted in the kelp I can't say but .. I have never lost a gun since I started freediving back in the early 60s using the "Cuban" rigging but I can't say the same for a few of my shafts. LOL
I personally like it simple and I'm not going to trade/loose my gun for a fish, (they're like my kids) several have been on the job since late 60's
Look...it all comes down to the enviroment you're in. Here in the East and offshore if you "hold to the line" it will come to an end and then what, Fight it?
"Clip off the gun with a floatline" Not my guns, too expensive, I love them. LOL
"Clip off line with a float" mybe if your're freediving, a good way to loose your fish, spear and line.
Simple: Floatline, spear and the fish at the other end. Go topside after the shot (hogging your "floating stick") and follow the marker from the safety of your boat and retrive what is left of it soon after. Beer anyone?