Posting film back and forth isn't too much of an issue, after all, I did it with Kodachrome and also when I've used DR5 lab. The big issue is the lab you've located and it's great that they're able to deal with amateurs sending in short rolls, but overseas amateurs just adds to the hassle and it may not be worth their while. But if cinelab are set up for overseas payments and shipping, I'd still love to join in.