Therefore i want to ask the much more experienced users here for some advice on how to handle that. Maybe there are some "best practices" which i don't know yet.
Don't take this as legal advice, but if someone would address me as "Dear Binancian", I'd probably ignore them. What's the point of all that KYC if they can't address you by your name? But I wouldn't use Binance anyway, they
freeze your funds when they make a mistake.