Of all of those suggestions, the most effective would be the employment piece. Employment is the magnet.
I would be interested in a study to note how many come here for employment, and how many for freebies.
Employment is one pole of the magnet.
The other pole is free government cheese; welfare, section 8, EBT, WIC, SSI, etc.
If all they could get from any level of government is a ham sandwich and instant one-way transportation to their country of origin, we'd save billions.