I agree with Ken, in the past BPX I was part of, there was simply a mention that we should notate in the signup if we would PREFER to keep it within our country/area if we couldn't afford overseas shipping, this seemed to work just fine. Those who were ok with shipping worldwide would, and those who would prefer not to could ship CONUS or if they lived in Europe or whatever could ship there, and if there were an oddball, someone would have to pick up the slack but it could at least give the preferred "local" shipping first priority.

So, I say keep it as usual.