Honestly my opinion is who cares about this person, let him do a reverse Micheal Jackson and turn his skin black. He has the autonomy to do so, doesn't mean he actually feels like a different race and if he thinks he does as he has so much disphoria about his body then let him transition, I see no difference between this and trans-gendered people, they both suffer from crippling disphoria that makes then incorrectly believe they were born in the wrong body, so if the cure for their mental-illness is transition then let them change. If it saves them psychologically then I might be in favor of the procedure being free.
But if they haven't been diagnosed with disphoria then they have to pay themselves for their surgery