Sounds like a simple custom job. I think it's safe to say that there is nothing commercially available for you. I would start with a rough "mock-up". This will allow you to determine the minimum length for stability of your crossbar or foot. I would use a 2X4 by 10" or so. Screw it to the bottom of your divider. From there you should be able to sense it if can be shorter and still stable. Then re-cut if necessary. The final design could be made by a pro, like myself, if you would like. Perhaps it may need adjustable feet attached to the wood foot also.

Here is a link that might be useful: TMW products