This is a Halachic Sha’alah that should be asked to a Rav/ Posek — not the coffee room! If it’s applicable to tomorrow, get in touch with a Posek ASAP! When I worked it the secular workplace I had similar issues at times, and the Psak differed based on many factors (the importance of the meeting — work vs. social pleasure, the results if I wouldn’t go — both the obvious and the possible ill-will as a result, the location of the meeting — in the restaurant itself vs. catered in a more neutral location like a conference room, if other frum people were involved — sometimes we were able to arrange a Kosher table)
Maaris ayin may be more of an issue if you are just sitting with everyone sipping on a drink where it may seem like you are part of the meal then if you bring (or have ordered) special Kosher food with numerous wrappings. Sometimes a Posek may tell you to davka make sure that you have plastic utensils clearly displayed or the packaging on the table next to you so that even a casual observer can see you are not eating the restaurant food.