The technology exists in affordable scenarios. I used to be around portable gas analyzer's every day at work. One has the test instrument, trained technician and calibration gases. Walking around with the air pump going continuously would be difficult.
I personally use Catmandoo Pale Ale to mark my area. I drink a lot of coffee. Nothing grows where Catmandoo goes.
Anecdotal guesses are that the scent glands are in the arm pits and it is a fear response that is carried by air currents, not dispersed in urine. I have been hit with the scent several times. Their normal scent for males and females would be left with their tracks. Their feet leave scent all of the time. Factor in weather and heat.
There is an affordable and cost effective approach. It is called DOG ( dawg ). Highly sensitive sniffer, almost autonomous, all terrain 4 paw drive, and will alert humans to danger.
I understand the bleeding edge technology that is on your wish list. However, one must consider that the smart Sasquatch will observe you with high tech gear and lead you in circles or off a cliff. Go with a smart dog. Can you borrow a cadaver dog?