You could try taking a cold chisel and hammer and striking the original bends in a couple spots. Much like the commercially available pikie 4 lip. It will stiffen it up a bit.
Another option would be to source thicker gauge stainless at a scrapyard and bend your own lips.I bought a 3'x12"piece of stainless for $3 from my local scrapyard and bend them myself. Time consuming, but you get the lip you want.
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