Transpronomial (transpronoun): using pronoun(s) different from your assigned pronoun at birth; pronouns that do not align with or are uncommon for one’s AGAB (assigned gender at birth); not using one’s assigned pronoun; someone who is not cispronominal (cispronomial/cispronoun).

And since I once used this as a synonym of cross-pronouning, I suggest enantiopronoun (enantiopronominal/enantiopronomial) as an alternative and specific term.

Just as not all trans people consider themselves gender nonconforming (GNC), the same can happen with transpronominal people with PNC, for example, a she/her binary unipronomial trans woman and a he/him unipronominal binary trans man. -Ap