1) They need to leave. No staying here being "deemed worthy".
2) Need to put teeth into it. The farmers need to be responsible for ALL aspects of the migrant - healthcare, lodging, food, everything.
3) If the migrant leaves the farm for other purposes then the farmer needs to be financially and criminally liable.
Under these conditions it could maybe work.
I would accept this if your #2 was strictly adhered to. No medical and welfare given to any of them.
If that isn’t good enough, they get sent home.
You’ve just described the H2A program 😀