If I had a store or other facility requiring restrooms, other than the obvious solution of "one-holers" (single occupancy restrooms), I would have three restrooms designated as follows:
One with a sign that reads: "MALES AS LISTED ON BIRTH CERTIFICATE"
One with a sign that reads: "FEMALES AS LISTED ON BIRTH CERTIFICATE"
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And one with a sign that reads: "ALL OTHERS" or "WHATEVER" or "ANYONE AT ALL"
I am really not trying to be funny here and not sure of the legal implications of such a plan. I am trying to protect those with, um, "still arguably traditional" bathroom sensibilities.