A chunk of the federal employee base will have something like "LTC" or "Dr." in front of their name, which again confers no indication of gender or preferred pronoun.
I don’t understand why you’re going through all these weird lengths to solve a problem that pronouns more optimally solve and cover more use cases (e.g. nonbinary people).
People should do what they want with pronouns in email signatures. But I don’t understand why you can’t string these together.