"I have a personal opinion that pronouns are not important."
The point of respect is that your personal opinions are not important; the opinions of the person on the other end of your communications are.
Not sure, status quo in the office has always been that people passing as male are he/him, people passing as female are she/her and everyone else is they/them (including groups of people homogeneous and heterogeneous alike)
That we’ve managed to conduct our society so far without using alternative pronouns such as “xi/xir” is a strong indication that it’s a neo-political construct and, while I might be sympathetic to the person who prefers to be called by those terms, I will not go out of my way to force everyone in the company to - they’re also usually referential (without the person present) and I will get them wrong myself too.
Whatever your employment contract says is what goes into the employee directory, and should be consistent with the tax office.
If you’re referring to pronouns then I don’t have a good answer honestly. I have a personal opinion that pronouns are not important. If you want to call me mister or miss or Mzzz then that’s not going to cause pain, unless you do it with malicious intent.