Hi, just a few points.
EZY did some pay to fly(for line training) last year through a third party but have stopped this because of concerns by trainers( some of those paying were not up to the ctc cadet standard) so there is no point fighting easy on this matter.
There may be stretching of the rostering agreement but I have not heard of actual FTL violations.
All bases are in EU so why would work permits be required unless you are from outside?
There are issues with French employment rules which have been discussed elsewhere.
We used to recruit mostly experienced f/o s with a few selected low hours cadets, now it is all cadets as they are cheaper, there is much that should be improved in their terms but it is not a pay to fly scheme.