NO! I can not give up! I think I got a solution to this
What if I make a huge trigger_once (with monsters and no client flags ticked) which covers the area under the path_corners? So when Apache dies/gets destroyed, it must fall through the trigger_once in order to hit the ground and explode. It might work? Right?
note: Also we have to make sure that there aren't other obstacles which the Apache can hit and explode before going through the trigger.