I don't want to burn through my plates, testing this but I had a similar thought to yours.
Kinda of different solution though.
What makes plates LVL4 capable isn't their addition of aramid fibers behind the core, it is the addition of ceramic plates infront of the core. I went to home depot and bought a sheet of octagonal tile. I plan on cutting the tile to fit the shape of a plate, and then filling in the gaps and basting it with Silicone adhesive. Once properly infused, roll the plate in codura like wrapping a book in Xmas paper, and applying the adhesive to every layer creating a lamination effect. Also you want the adhesive to catalyze under pressure so find some way to apply pressure to the plate without cracking the ceramic for at least 48 hours. You will want at least 4-6 folds of laminated cordura behind the newly created ceramic core. This new plate will ride IN FRONT of the UHMWPE. The ceramic disrupts and breaks apart the steel core, and the UHMWPE acts as a net to catch the slug and tip rements.
Tactical Nylon Micro Brewery
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