My comments only really apply to the US since that is what I have some experience with. I do remember that there was Vioxx litigation in Australia and I think there might be some stuff ongoing in the EU right now (maybe France).
Might be a good idea to reach out to the Foundation and maybe create a centralized database of interested parties and their countries of origin. I don’t know if it is possible at this point, but if so, there is definitely strength in numbers.