The only way I can see you doing it is by using spawn points, so make them all spawn in this box and half of the boxes have a trigger_multiple that causes one door to open, and the other half has the other trigger_multiple.
Then they will fall through the trigger_multiple into a trigger_teleport and get teleported into the area they are supposed to be in
What I did is that I let the Beam in the middle of two func_button and behind each button is the beam's target and every time beam hits a button it triggers the thing i want. I can do this with more than 2 buttons.