> just done with the half motivated people
Other motivations are likely to attract people attracted to those other motivations. You obviously think there is a high correlation between free-flight-to-Nepal, and desire-to-learn-TypeScript. Seems unlikely.
Nepal is poor: why not find some local students? Instead of wasting money giving free flights to rich 1st world people, why not supply a few computers and training to poor 3rd world people.
Make your entry requirements highly correlated with geeky keenness for programming?