6) Beef up border security seriously by an order of magnitude if necessary dare I say wall AND ensure all but a tiny fraction stay on their side of the wall until and unless the US opens the door for them in some limited and measured way.

That can't work. You can't build a wall on most of the border. The border's in the river. You can't build a wall in the river. You can't build it on the bank of the river, because the river level rises and falls. Any wall/fence you build is going to be many, many yards of dry land away from the river. By the time the migrants get to whatever wall you build, they're already on U.S. soil.

Remember the video the other day, with the migrant family wading the river? The Border Patrol officer was literally right there. You can't get better security than that. But all the Border Patrol can ever do is catch them. He can't shoot them, he can't physically force them back into Mexico - all of that would be illegal. All he can do is detain them, and if they make a claim for asylum then they can't be summarily deported.

The best security in the world can only make sure that anyone trying to cross the border is spotted and dealt with. You can't physically keep them from crossing the line. And since our problems aren't primarily with people crossing the line without being caught, but what to do with them after they get caught (more like turn themselves in as quickly as they can), border security can't solve this problem.