We're at opposite ends of the spectrum, and that's ok. I have absolutely zero interest in DNA gathering or proving that sasquatches exist to anyone but me. A solid footprint impression, red eyeshine, return wood knocks, whoops, thermal videos, and more are still what tickles my fancy and has motivated me to get out in the woods often these past 17 years.
If you want to try your approach, base solely on collecting DNA, and get others to do so as well, I'd cheerfully applaud your efforts and look forward to seeing the results all of you have found.
In the meantime, I'm going to continue to trudge along using primitive methods in hopes that I can find a sasquatch or, more likely, it finds me. A fundamental difference between our approaches is that mine may involve actually looking at a sasquatch peeking from behind a tree across a secluded pond. I'm nearly breathless with heart pounding, just waiting for it to move. Actually living the discovery. Your approach doesn't appear to place any value on ever seeing one ... just get its DNA.