I suspect that blindness changes the rules and expectations by quite a lot, so most of my advice would fly out of the window.

However, I do personally have a problem with remembering names, and so I have one bit of advice that I think is relevant.

there’s no polite way for me to say “hi, who are you again?”

My advice is that, if you think you have, say, a 60% chance of getting their name right, just say that name. If you get their name wrong, they’ll probably correct you, but if you’re anything like me, when you think it’s 60%, the odds are actually much higher.

That is actually what I do, personally, as a person who is bad with names. I realized that I used to mentally punish myself when I messed up a person’s name, but conversely, when somebody else messed up my name, I didn’t care and immediately forgave them. Basically, I was holding myself to an insane standard that I didn’t hold anybody else to.

So, instead, if I think I more likely than not know the name, then I say it. I’ve only had one person get upset with me in all the time I’ve been doing this. It’s a person who I used to run into fairly frequently, like once every couple of months, but I seemed to have a mental block on his name specifically, and I simply couldn’t remember it no matter what I did.

My only other advice is to be careful about letting people know you can identify them by odor. It depends on the odor and the person, but some people could probably be offended by that.