Xiamen airlines is 100% owned by China Southern. So expect similar CAAC medical issues. It is quite carrier dependant. And the attitude of the candidate.
The elephant in the room is not so much passing the initial medical, its actually keeping it valid. So you pass the initial and are offered a position, resign from your current employer, it can be a big setback when in 6 or 12 months they say your blood flow rate is restricted, or your ECG is irregular.
With the big bucks pay comes associated risks. Otherwise everyone would be doing it.
And there will never, ever be a transfer from Skipper on 737 to 787 . But a carrot they will a dangle...