No, no, and no...
I was actually thinking that since it's aluminum bar stock, you could just make a triangular piece and rivet/weld it to the existing rear angle so that it would naturally overlap the bumper. A neoprene gasket (old door seal) would keep water/dirt from getting in there, if you were so concerned. That would make it possible to sweep the angle right back to the tail end of the bumper!
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