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I briefly tackled this in the past, and if there is more interest by others I will give it another go.

Honestly, you should check out the Better Whistle. I recommend the one with a pea. My initial attempt couldn't come close, and their design is VERY good. There are a couple a derivatives which fix the mesh issue. One is called Survival Whistle which you should also check out!

Better Whistle
Survival Whistle