Could the community perhaps help ? Residents of the various prospective destinations are the most likely to know - among each other, individual experiences can of course vary - how their customs work.

We did something like this at Openmoko:
http://archive.today/jlt53

Also, people living in a country with unpredictable or overly restrictive customs may bring the device with them when they travel abroad, or ask friends to do so. A strict filter based on country of residence would therefore exclude people unnecessarily. It would make sense to show those at higher risk of encountering problems a warning, though.

- Werner