I'd probably ask their name and pronouns first and go from there.
For me, socially, it seems odd to start with that before saying "Hey/hello", no?
Its odd since they know what I look like, I know what they look like. Why pretend I guess that I don't know his (or the preferred pro-noun's) name? Seems kinda rude in a way but I would never want to overstep a line or make someone feel bad.