I think that these make sense. Do you agree?
1 Which one of these three schools' headmaster are you? (I think it's easy to understand)
This one is more difficult.
2 Which one of these three schools' headmasters is you?
(A person is looking at a picture with headmasters and know that I am one of them but wants to know which one of them is me)
Makes sense?
"
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Ticce1 Which one of these three schools' headmaster are you?
... headmaster needs to be plural. There are three of them.
I prefer " Which one ... is you"
A headmaster is almost always in charge of a school, so the word schools' is redundant.