Self imposed exile
Then you got to be responsible for their food and training...Make every 18-25 year old join the military and have them build infrastructures, this is a must.
18-25 makes up 30% of the population.
Could work though if you had the money and a strategy to motivate them to keep productivity high enough.
200/hrs a month per skinny = 1 billion man hours per month if you had 5 million 18-25's on board.
A typical 2 lane African highway would take less than 10,000 man-hours/km, a 4 bedroom house...2,000 man-hours.
In other words, if you had enough building materials and energy, you could build most the infrastructure we need within a year.