The T & A might get cause giggles.
I am all for a T, A, or O (ironically those 3 spell Tao). Would make getting pulled over by police and dressed up a little less embarassing, since the police would know that means gender ambigious, and it is included in such state recognition. Also if travelling or passport and such. Only a few applications included Other, that I have filled out. Website registration seldom has Other. Getting carded buying alcohol, pornography, or cigarettes would lessen the fear of discovery.