Eva have had the "cruise captain" program for years.
Meh thinks it is based on the fact that their
law says they can not hire ex-pat F/Os, as the locals should get the F/O jobs.
To get around the law, they call it "cruise captains".
I had a similar job in the Middle East. Got paid 80% of captains pay instead of the usual
70% and would sit in the left seat during cruise while a junior F/O was in the right seat and the skipper back in first class eating dinner and drinking tea.
For take off and landing I was in the right seat and the junior F/O in the observers seat.
"PIC Under Supervision" is quite useless in my log book.
Perhaps it is a different program these days with 2 complete crews on the 777 and MD11s?
Good luck.
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Men, this is no drill...