How about dropping he/she him/her and just using "it"? Much more efficient and environmentally friendly: no mental workload trying to remember a variety of pronouns, no risk of offending someone by mis-pronouning them, no need to waste resources making badges and producing guides, saving data storage by not including a line about pronouns in email signatures. Sorted!
And that sign on the toilet door in the photo is amusing me. The symbol on a white triangle for some reason reminded me of hazardous material signs. And then I remembered that in the UK the triangle is used for warnings in traffic and hazard signs, so subliminally we learn that a triangular sign warns of danger. So not a welcoming sign at all.