Start with a very rudimentary initial screening and after say a 2 year trial period have a selection process based on what the person in question has accomplished. That way people get to prove themselves and what the can contribute with instead.
If you don't contribute, i.e. receive social welfare or similar, you're out. If you contribute by performing in the labour market, start an at least moderately successful business or similar you're in. I don't understand why all immigration systems don't work like this...