Having looked at aerial surveillance from a practical and experimental standpoint, I do not have the same confidence that it would be successful. In other words, I have put myself in an airplane with various cameral setups and run experiments. Even with a very long lens, you have to fly very low to get photographs with sufficient detail to be of any worth. The PNW forest canopy is your enemy. Most areas have nearly continuous canopy hiding the ground and anything on it, from being seen from the air. The best aerial views were obtained imagining down at about a 45 degree angle. At least that way, you have a chance to see the ground and what might be moving on it. FLIR cannot see through tree foliage any better than visible light. And what you get, even with expensive FLIR systems, is poor resolution. So poor that you could not tell the difference between a human and a BF with most images. You loose scale or size determination from aerial photographs. Night drone work is now specifically prohibited by FAA regulation. A hydrogen drone would be very dangerous. The tiniest leak and any kind of spark and you have an explosion and set the forest on fire. Explain that to the Forest Service.
Lets say that you successfully image a BF from the air. Find a sufficiently remote place where BF is caught out in the open. I believe I have seen one from the air on a ridge line so I think it possible. Even with a HD image what do you have? A picture, no way to scale the image, and probably taken from such a distance that details such as hair or whatever cannot really be resolved. Hoax, man in a costume, etc will all be on the table with no way to get supporting evidence like footprints etc.
Personally I think lower tech, habituation situations, or sweeps through active areas are more likely to result in meaningful contact evidence which might get main stream science interested. One more blurry picture taken from the air will not do much of anything to interest science.