Well, maybe Jeff-Groves and others of that level might be able to find a "collision detection" hook or a PK button push. You know there's a button push link somewhere in the files, since the light turns red or dark upon a push, and you know there's a collision detection in there because you will be warned with a Speech ogg about an imminent collision, so there are "hooks" for those things, just no audio associated with them. Seems to me it's do-able, but this shtinking game and its limitations have stopped my ideas before...
'Course, some folks don't let limitations "rule"... Maybe you could find that Speech (9 folders? and it's in each of them probably), and mix the two bits of audio together for the collision? Hopefully, it's not a "SHOUT!!!" line...
Edit: NaO_P_Enemy_ship_on_collision_course_sir.gg in folders 1, 2, 3, 4, 5, 6, 7, 8 & 9...