Well, I have to be honest, it's not going to be easy and will take some time and patient as well as initial investment once you meet a potential girl.
I am in an industry where I deal with a bunch of foreign students and when talking to them, most girls have been approached by generous gents.
Well, I know of a couple of girls who picked up older boyfriends who are financially stable. One girl actually slept with a cell phone store owner because he was nice enough to hook her up with a new iphone. He's probably banging her right now. You never know.
I deal with these students as a job, and even have had a few students who sort of came on to me. But I chose not to get involved with my clients as that could complicate a lot of things. I don't want them to get emotionally involved and come knocking on my door and talk to my wife like that rs girl did to my friend.
If you want young, foreign civilian gf, I would suggest invest in the time and effort. Hang out at starbucks near FIT or Parsons, or any of the countless language schools spread throughout the city. Show interest in their culture and possibly offer to do language exchange. Maybe you can run into a fresh meat and be her "friend" first before developing that into a relationship. Sure, it's a lot of work, but I guess the rewards can be worthwhile.
If you want an easier way, stop by Envy that I mentioned earlier. Most girls working there are on a student visa and go to language schools. Some of them go to school to maintain their student status and remain legal in the U.S., while some are genuine students who work there to earn money. My friends and I have gotten numbers and met them outside of the club, and there is a definate possibility of more. For example, I got this girl to pose for me nude during first encounter outside of the club since I do photography as hobby. I could've def. gone further, but chose not to. Then again, I'm 6' tall (on the taller side for Korean), early 30's, decent looking and in shape, so it might have been a bit easier. But hey, you never know. Just be genuinly nice to them.