So there is no automated way to add multiple titles, the only work around is manually editting the titles. Only mods and admins can do this, from what I can see.
I would rather users choose the title they most closely relate to. That being said, they will still show up in each group, which we now link to in the welcome message.
(we could probably do some more fine-tuning on the welcome message, so if anyone has a suggestion for an edit please use the “Reply as linked topic”)
So, for now, if you would like a mix of two titles you can reach out to me and I will add it for you. Keep in mind, you must already be in the two groups you want to mix, and adding yourself to another group may override your title 