OT: Marlin Spike

Is there a way to put a marlin spike loop mid span in a section of twisted rope without tying a knot in it?
Back in the winter of 1980/81 I took a small craft and seamanship course from the USCGA (D-9) with my Uncle Paul.  I learned how to back splice, straight splice, and how to loop splice the ends of a rope, but I'd like to make a tow harness for a boat that centers the load on both rear tie down rings.  Ideally with a float before the loop, and the splice extending further than the length of the float.  All I've ever used is loop splices in the real world, but I could figure out the others quick enough if I had to.
The only thing I can think if is to make two loops through the float with two different pieces of rope.
I'd like to be able to quickly clip each end on to one of the tie down rings on a small (relatively) craft and toss the float straight off the back for a tow line to clip onto.  This is not intended for skiing.  Its intended for towing a disable watercraft.  In some cases one much heavier than the tow craft.
For water skiing the ideal setup is to come off a pole well above the deck with a single line on a mount that can swing easily.  I have one, although I have never used it.  Never was able to ski more than a couple hundred yards without turning myself into a torpedo.
Untwisting and retwisting a long section of rope really is not an answer.  I want to do this with nylon rope and it doesn't tend to retwist very well.  The only reason a loop splice works with it is because tensions clamps the strands to each other after its woven. Well, and I also lightly melt the ends so they stick in place.
The only other thing I can think if is lashing (whipping?) with a light cord instead of splicing.  I'm not sure I am a fan.
Yeah I know how silly that all sounds.
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Bob La Londe
CNC Molds N Stuff
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