If we send multiple copies as individuals, that's different.
The European Tribune is an online forum for civic debate, with a strong focus on European issues.
That's one possibility (we may need one of those anyway), but probably the best thing here is multiple copies or, better, multiple signing by individuals from as many countries as possible. With reference to European Tribune, certainly. (Contributor, contributing editor, etc).
May need to list both nationality and residence. Nothing is 'mere'. — Richard P. Feynman
