What "warfare-state" model? Shutting down the borders is not really warfare, is it?

And there hardly is a thing that is more difficult than effective third world aid. Its not that no one tried before, but good meant is often enought the opposite of good. Sometimes the aid even hinders any sustainable developement. (eg food aid, the simple picture of "feeding the world" by flying all the food that is not needed in the west to the hungry in Africa. This is good as short term means to prevent starvation, but when no reasonable campaign follows that ensure them to feed themselves in future it just makes everything even worse)

And I highly doubt that helping to recover the African economy could help to reduce the immigration numbers anytime soon. Even the best "welfare" stuff could not make any differences in the next few decades.