There are some folks on this board that can give you more more information than I. Steamer comes to mind, if he is around you may wish to PM him.
I worked very briefly on yachts over 45 years ago and found it to be an insular group. I enjoyed my time though.
I also know some very well qualified mariners who tried to get jobs on yachts in the last few years. None had good luck. One crewing agency told a friend of mine who has over 20 years sailing all over the world on everything from ships to research vessels, has a USCG Master license, unlimited DP certs as well as owning a sizeable sailing vessel that commercial officers do not usually adapt to the yacht world so the chances of getting a job were small. Personally I would not bother with ABYC certification unless offered a job first.
I’m told it’s best to have a British, South African or Australian accent when applying. It seems to charm the newly rich. 
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