How about referring to the person by their name?  That would avoid the problem of "do I refer to that individual as zi, or they?" and potential for assignment to sensitivity training.

First name use would also solve whether to address someone as mister or misses or zhi'es or theyes or what ever. It would just be "hey, X" or hey, Y".

But if that isn't good enough and preferred pronouns are still required, then can one more be added?  It would just apply to me and my preferred pronoun is "whamalama".  Thank you for your understanding.