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Shrinking down your queries is for your benefit, not the forum. You mentioned no one has replied or shown interest. Most people don't care about a topic unless it is clear within the first sentence what being asked for. That's true for everything but especially fringe topics.

I do not know enough to about EDNA. From what little I do know, without BF DNA to compare to, if it is found it may just be white noise or considered human/contaminated.

The Columbia River Gorge is a petri dish for getting lost for the Portland Oregon hikers. It is close to town and easy to get to. They had to close all trails to keep people from their normal hiking and getting lost during the Covid 19 thing. Most often dead or out of service area cell phones are the excuse. Commonly people leave too late in the day to get back before dark. I think the only thing that can reduce that demonstrated idiocy is huge fines or charging for the search when poor or no planning, lack of proper gear, and inadequate clothing is involved. Word will get around that being stupid can be costly.