Hola!
Has any of you guys ever had to simulate/solve combat between two teams, from different races? AFAIK, they are not mechanically capable of fighting each other. However, in my current game there are multiple factions starting on Earth and I'm expecting some of them to clash on various Sol bodies through their teams. So no armed starships and no actual GU's are present. I don't want to just arbitrarily flip a coin or something.
Does anyone have a good system to recommend for solving this, or something like that? Or am I just being far too complicated and I should just roll a dice and call it a day?