alumnux

A transsexual, transgender, genderqueer, gender non-conforming, or bi-gendered former student or pupil of a school, college, or university.
Alternative spelling of alumnus (masculine; plural alumni) or alumna (feminine; plural alumnae).
Plural: Alumnax

Singular: He is an alumnus, she is an alumna, and I am an alumnux of the same school.
Plural: We welcome all former graduates to our alumni, alumnae, and alumnax weekend.