laboratoria.la is doing one of the things you've mentioned. Their students give back a certain percentage of their salary for 3 years after graduating. There's

laboratoria.la is doing one of the things you've mentioned. Their students give back a certain percentage of their salary for 3 years after graduating. There's also start-up based in Nigeria or South Africa, I think, which gives students the finance (like how students loan work in the UK or USA, for example) they need for them to attend top Western universities.