I think the only thing we should be doing with illegals is making sure they become Mexico's problem again. Our borders could be almost air-tight if we really wanted them to be, and we wouldn't need to reward lawbreakers to do it.
Properly spaced Mobile Command and Control Units, integrated with sensors, drones and armored vehicles, troops and our satellites, all for just a start, could be employed immediately and effectively within a relatively short time after funds are appropriated...