Hey. That really sucks. I have seen a couple of people from other boards in this same situation.
The only thing I could find that worked was to list an address for someone you know in a different country and have them ship it to you. I have not heard of another way.
I wish there was something else I could do to help you.
If you end up not being able to use it, I could really use the invite. My phone is on it's way out and we are stuck paying a really high phone bill until we can switch carriers, but we can't switch until I can get my hands on a OnePlus One. So if you are running out of time please don't just let it expire.
Best of luck to you. I hope you are able to figure it out.