It would be worth trying. It could work. I am not one of those that says a "plan will work". I believe we need to actually try things and be willing to adapt and say "that works", or "that doesn't". It likely would produce a combination of things that work, and do not work.

My only real thoughts are on the securing the border part. If there are sensors will they be easy to trip so cameras are constantly firing off. People may stop paying attention unless as you indicate those that are doing this by crowd sourcing are compensated in some way. As far as wild life moving back and forth, I personally do not know how necessary that is or is not the the ecology of the area. I do know that a physical wall of sufficient design would be likely to be more of a deterant that sensors, but it would still need to be monitored with sensors as well. Sensors can often be defeated and they can be overly sensitive each which present their own set of problems.

Also, currently we have a lot of people NOT enforcing laws. That is a problem. If we do as you indicate that would likely still be a problem. This is true of many "laws" beyond simply immigration though.