Unfortunately, there is no way to slide a rod-pocket curtain over a bracket that attaches to the rod. If you could find some sort of clipped hook (not a complete ring) that would slide over the top of the rod, you'd come closer to making it work. But that may only work if you have one of the special rods with the curvy support brackets (kind of like the wire closet shelf/rod systems).
I think your answer may be to cut that middle panel in half and sew a half to each of the remaining full panels. Put the "half" portion to the outside, where it will more often be stacked back.
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cut in half
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