Whenever I’m having a chat conversation with an Italian workmate of mine, and something comes up about Italy or “back home” I throw the Mexican, Hungarian or Irish flag emoji into the conversation in a supportive manner. Not every time, just enough for him to correct me and me to apologise each time I do it. “Gah, sorry again, it’s just such an easy mistake to make!”.
I also change the font slightly of certain chunks of email text I send so that people think it’s been copied and pasted and wasn’t written exclusively for them. Usually everything after the first pleasantries sentence and before the final goodbyes at the end.