I'm sorry, but you are building on a false premise. If you goal is to lure children unmotivated to learn programming you'd better be distributing sweets. Or (if you ask a Far Eastern, or Eastern European mom) threaten those brats with punishments. Replacing "for" for "voor" is not even a barrier removal as much as you seem to believe. Because "for" in programming has a separate meaning, and you'll spent the same amount of time explaining how it works whether it "for", or "voor". Except that programming-for can be useful for farther studies, and programming-voor is much less so. I answered here in a longer comment if you are interested:
https://news.ycombinator.com/item?id=42840778