I was already thinking cleat, and see that you've linked to one. I think a small cleat has real potential. You can attach to the RL by pulling a bight through the middle and pulling the bight over both ends, then you could put a small eye bolt sticking out the bottom of one of the mounting holes, and that could become the "pulley", for getting a little mechanical advantage. Might not be the lightest solution (or very elegant for that matter) but I may try to make one just to see if it works.
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adapted from - ancient gaelic runes