Supine Harness

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I am in search of a Supine Harness. One which will allow me to be located under the control bar with my feet forward. At launch I will have in my left hand an aluminum tube 3/8” in diameter x 1’x1’x1’ triangle with a 3/8”’ rope going through it, tied off at the corner where both ends of the aluminum tube meets at one of the 3 corners of such triangle and the other end of the rope will be tied th the CG point at the locking Caribeaner. This triangle is used to place both of my feet into right after takeoff.