An adjustable splice?

[benz]

Asking Samson is a good idea; they've been helpful to me in the past. My instinctive reaction to the idea of the splice was mistrust: I like everything to look tidy, and having a hundred-foot tail emerge from amongst the braid of a rope will not be very tidy or symmetrical. Then the thought of undoing and redoing splices doesn't appeal either.
Perhaps I will talk my client into using a different method. After all, there's more than one way to skin a cat....
Thanks all!
Ben