Anyone here (besides me) consider this? I would think a cheap box of sparklers would be practical, conveniently sized, and cheap. Or how about a piccolo pete as a whistling signal, or a pack of firecrackers as a percussion signal, or a fountain cone, or a smoke ball?

Maybe I will have to reconsider what I will be putting in my PSK. There's some easy ways to make a lot of cheap fireworks more rugged and weatherproof.

Yeah, there's an associated risk of starting a fire when deploying some of these things. It should be managable if you know what you are doing.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)