...

"There is also the possibility that if the plane were taken to a country with less restrictive regulations, say Costa Rica, then certification wouldn't be required."

Do you think that Uncle Sam would like (e.g.) Costa Rica to have a suborbital intercontinental launch system capable of delivering 500 Kg + of payload with piloted final trajectory? How about Canada, or Baja California, or a staged deployment to offshore New York? or DC?

You'll note that there has been a very careful effort NOT to disclose the downrange capability of this ensemble. Everything is phrased in terms of altitude and the craft usefully returns to its launch site.

This is a manned V2, potentially...

(Nothing against Burt - he's doing the Right Thing, but someday, somebody, will do the WRONG thing, IMHO"