I've seen the version below, from BKBrown (Brian) on CN with what looks like a 19mm ply triangle that is forced/pushed up into the triangular recess between the steel legs of the tripod by the action of a large nut/threaded knob (below the ply) on a threaded rod extension shaft, see pic.....
It's not as pretty as Matt's creation (Hello Matt), although you could paint it black. It would definitely make for a more rigid structure for little effort, especially if well profiled (in 3D) at the leg recesses at the vertices of the ply triangle and/or rubber coated in those zones.
Best
JA
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