No , never CX but Middle and Far East long haul schedule.
I do appreciate the different points being made, if I was going into bat I would just prefer a stronger case, that's all. I was just passing comment as someone interested but as it is potentially a serious issue for you guys I'll butt out after this!
I haven't flown charter for a long time but used the MAN/TRF example as two four hour plus sectors, an hour turn-around and all at night, two nights in a row followed by a short Palma turn around! Two crew but I would have welcomed a bit of in flight relief, for sure.
In the days of the classic 747 I was a pax HKG/MEL and was fairly sure the crew was just one Capt, one FO and one FE, don't think you employed SOs in those days! I am now butting out!