Hmm... isn't it a bit overkill to have a discrete AFTN address for each user? Can't think of any real need for that from the point of view of individual pilots, or even aeroclubs... maybe handy for smaller fields without an existing AFTN connection, but other than that it's over the top. It's going to cause problems, I bet.
Not criticising just for the sake of it, but I think I prefer the French approach, which is simplicity at its best... no need to register or remember a password or anything like that, just fill in the boxes, read the briefing info, and fire it off. Paris takes care of the rest.
Plus why would they need my full personal details, or for that matter anything beyond what needs to go on the flight plan? Remember the KISS principle, chaps.