Don't import NA players. Import tier 2 korean players and teach english.
modern problems need modern solutions
You could just look at the stats and pick the top 3 players leading in Rating and ACS. I remember last year, Xenom and Cortezia were leading both of those. People used to say that Xenom had insane numbers only because he was playing in a weaker team. Nobody believed they were ready for tier 1, but look where they are now.
Importing Brazilian players is easy as hell. The majority of them already have a decent level of English. The Euro has six times the value of the Real, so it's also cheap. The only thing they need is a good coach.