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Best thing I find is to do your own thing!
... there is effectively no way of standardising the pronounciation, let alone standardising to a given "correctness".
There is such diversity of pronounciation of such things between native English speakers ( and it tends to be those who get most "hung -up " on "correctness" ) that it is clear that when the question of how those people speaking other languages might say these words is fed into the mix there is effectively no way of standardising the pronounciation, let alone standardising to a given "correctness".