Hello Tom,
Perhaps you may ask here:
Net-Marine - www.netmarine.net ? Voir le forum - Recherche d'anciens camarades ?
Or contact Ange(l) who originally is a flight sim enthousiast that now has access to current Marine Nationale crew and works with them for some recent videos. I guess he can ask the 12F guys about their older colleagues?
Here is his YT page:
https://www.youtube.com/user/dreamnflyvids
I'm sorry I can't help more.