I suspect that the Portuguese would try to recruit active farmers, with some capital to help set up farms in Angola. Former Farmers living in the favelas would also be an enticing target, but a lower priority target, as they would need more financial help from the Portuguese government to start farms in Angola / Mozambique.
The Portuguese government would probably provide loans with fairly low interest rates to members of Group B and C, and probably outright pay for Group A, since they are the "highest value" and "most enticing" immigrants
I agree that the middle-class (probably joined by a fair amount of affluent individuals) exodus would probably be the most serious out of the migrating groups.
Given the business-friendly nature of the Estado Novo, I suspect there would be a lot of capital flight to Angola / Mozambique. This may have the most serious effect on the economies of Latin America.
Reading yours and Viriato's posts, I remembered a group from Brazil that could be quite useful in Angola/Mozambique: farmers from the southern Brazilian states(Paraná, Santa Catarina, Rio Grande do Sul). European-descended(Portuguese, German and Italian stock mainly, although there's some other groups there, like Ukrainians), better educated than the rural migrants from the northeastern states(although not that much better in many cases), they were one of the main groups involved in the colonization push of the western states and the Amazon Basin in the 1970's. Many of them, and their children, are prosperous farm owners nowadays.
I'm not so sure capital flight would be the most serious effect, at least in Brazil. Sure, it would be a big hindrance, but much of the industrialization push was financed by government lending money through state-owned banks and development agencies(I think it was this way in Argentina as well) at first(and later on, the industrialization was mostly through state-owned enterprises acting in infrastructure projects). IMO, competition for foreign investment and the brain drain would be more influential.
Last edited: