Altersex

https://anunnakiray.com/2017/01/21/intersex-vs-intergender-do-intersex-transexuals-exist/ Altersex: A catch-all term consisting of alter, meant here as “different” or “another possibility,” and sex, referring to physiological primary and secondary sex characteristics.

https://medium.com/@pauljohnpoles/why-isnt-anyone-talking-about-subconscious-sex-db5bd49aec30 “Altersex” could be another option, though it does not seem to specify whether one wants no sex characteristics, or a combination of female and male sex characteristics.

https://www.quora.com/Can-non-binary-people-get-gender-affirmation-surgery-How-would-that-work Take a transmasc non-binary AFAB person. They may get top surgery to better fit their gender. Maybe look into altersex if you’re talking about bottom surgery.