If I were you... I would use query_posts() on my index.php page to alter my main loop to exclude the native language posts. This will keep everything working like normal, but users won't see native language stuff.
Then, I would create a custom page template in which I would again use query_posts() to create a custom loop that would only gather the native language blog items.
Give that a shot and let me know if I can offer more assistance. It's not that tough, especially since you have PHP experience, and the pages I gave have ample examples.