I didn't see your post about the original experiment, but it sounds like a great idea. I'd like to try it too, but maybe to overcome the timezone difference there could be some automation to the process. (Unfortunately I am not someone with the time or expertise to build such automation)

Another thought would be to work with friends/merchants locally. Demonstrating the power of bitcoin across borders is cool, but I'm sure people would appreciate free coffee even if the payment is coming locally!