trisher
Well lets try this.You have an accident in M&S you are cared for by a staff member called "Chris". You want to tell the store how well Chris did, you use pronouns.
Do you really think that pronoun badges have been introduced so that customers who have accidents which are dealt with by staff members with gender-neutral names don't have to come up with sentences that avoid gendered pronouns?
Rosie's reply seemed to me to deal with the situation perfectly well, but my guess is that nine times out of ten a distressed customer would do what the vast majority of us does - make an assumption based on what they see.
If 'Chris' is accidentally misgendered by someone who has had an accident that required assistance and the manager who took the call or read the letter reported it back in a way that made this clear, I would blame the manager, not the customer, wouldn't you? It would be easy enough to say 'Chris, well done for helping Mrs Bloggs when she fell on the escalator. She has been in touch to say thank you and HQ has asked me to pass it on.'
Irrespective of whether Chris was known to be trans, it would be a very insensitive manager who said 'Chris, Mrs Bloggs has written to HQ, and this is what she said :
'Your staff member, Chris was very helpful when I tripped on the escalator, and hurt my knee. He bandaged up my ankle very well, and called my husband to come and get me. Please pass on my thanks to him and let him know that the doctor said that my ankle is just sprained.' Or the same wording with female pronouns if Chris was a transman.
Now that I have typed out 'Chris' so often, it occurs to me that it might be a lot simpler if Chris used Christopher if he wanted to be treated as male (whatever 'treated as male' means), or Christina if she wanted to be 'treated as female' - no need for pronouns on badges.