"How does a junior co-pilot get regular landings, if so qualified? This one seems to have been qualified. (I am assuming that the relief pilot is the one who occupies the P3 seat for T/O and landing, and in the cruise moves into the seat of whichever pilot is taking a rest-break.)"
For all readers/posters on this forum : AF has
NO "releif pilots" / "3rd officers".
ALL F/O's were/are fully qualified to fly the A/C for T/O cruise and ldg.
At the time of the crash, il was only suggested that, at captain's discretion, the most experienced F/O should be PF seating in the right seat.
Pretty obvious, since, at that time, F/O's did not get (imho) enough training for flying from the left seat.
In response to the the crash (?), routine F/O training include more sim flying from the left seat. ALL F/O's are now well trained to fly from the left seat.
It's still up to the captain to decide who will be seating in the left or right seat during his rest time : the right seat F/O is PF ; the left seat F/O is "captain" (ie performing "captain's items of emergency procedures).