Bracero Program and before were workable. Not that they are directly applicable to today, but the paperwork to work temporarily in the US should be made many times simpler and easier than the convoluted, kafkaesque, corrupt abomination that it is now that benefits primarily medium and large agribusinesses by exploiting undocumented persons. The meat agriculture industry openly advertises salaries in newspapers in central and south America to encourage undocumented migration. It's a dirty secret that undocumented peoples who work for large industrial concerns are generally safe from ICE raids except for occasional token enforcement to maintain the pretense, while other undocumented people are subject to raids at any time. This isn't by accident but through the power of lobbyists and money.