I can take a piece of cord and tie a bowline loop on it, say 3 or 4 inches in height. A poor man's splice. I can attach the rings or the cinch buckle to that loop (here's where the pictures would help)...thread the top of the bowline through the rings or cinch slot, bring the top all the way around and pass between the two cords of the loop on the near side, bring the top back around through the rings or cinch buckle slot again. Now pass the standing end of the cord through the loop top poking up on the far side of the rings or out of the cinch buckle. Tighten.
So that takes care of the hardware end. What you are asking is if you had a cord with loops in both ends, tied a larks head or prussik on the folds in the middle of that cord, with both loops sticking out. One of those has hardware on it. The other one you want to put a ridgeline---or not---on.
So the question is whether, when only one of the loops is loaded, the prussik on the folds will hold. I don't know. But it is easy enough to simulate the situation by taking a length of cord, putting a prussik in the middle on, say, an overhead beam of some kind, and hang a big weight on just one of the free ends coming out of the prussik.
If that doesn't convey the thought then we'll have to break out cameras...!