That's one angle to take, but with the huge amounts spent in Europe on non-Western immigration; you could quickly rake up vast sums money for the kind of purpose you describe here by turning the European migration policy on its head.
As a specific example, Norway had a budget of 18.9 billion NOK in 2017 (non-English source) for "integration and diversity", or roughly $2.19 billion with today's conversion rate. Five years worth of similar-sized budgets, and you are up to roughly $10 billion, and that's all from a country of 5 million inhabitants.
With agreements with African governments, all non-legal migrants into Europe could be given the offer to be sent either to their home country, or to locations in Africa (potentially newly established migrant cities). It is much cheaper to provide for migrants in Africa, the labour market there is much, much more open to people with lower education than it is in Europe, and treating almost all asylum applicants and illegal migrants the same should free up a lot of money that would otherwise be spent on handling the individual cases, appeal processes, and other general benefits that can be expected by managing things in bulk. The flow of migrants would also be reduced to those who consider themselves to be in serious danger where they come from, unless the African migrant locations turn out to be success stories, which should be a good thing.
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