Softopper with Bed Bars Underneath

After years of driving with a fiberglass cap, and frustration with limited cargo configurations, we've decided to go the Softopper route. But now I'm stuck trying to sort out a shelf/platform that would it underneath the Softopper when deployed.

I recall KB Voodoo used to offer bed bars that mounted to the track cleats - 3 of those bars would have given me the cargo capacity I need for a Loadwarrior or similar rack as the shelf. I see those aren't on offer any longer.

I'm looking for something that mounts "underneath" the Softopper, i.e. does not sit on the bed sides thus raising the height of the topper. Any alternatives?

On the other hand, seems like lots of us have a rack/cage that sits over top of the deployed Softopper - the rack sitting on the bedsides and bolted into the tracks underneath - making the Softopper sit that 1/4" of whatever it is higher.

If I can't source bars like the KB Voodoo ones of years past, any lightweight low-profile options that mount with a tab that sits on the bed-side?

Who ever has a solution, let me know and post some pictures. I've seen at one rig with a skinny-warrior inside a Softopper mounted to bed bars (although I can't recall if the bars were the top-of-bedside type or not...

Thanks!