yes you can, create an invisible weapon which fall down (probably heavy weapon, very easy to code since it`s just a few frames). WHen the invisible weaon is on floor do the width check - make sure your zboundary difference is unique, for example if you take zboundary 400 and 500, the difference is 100 - thats the area where objects can appear and this +15/-15 must not be used by any other background, thats the hard part 
This width check works with two type 3 objects, they move up and down the zaxis quickly with hit_j, then move down and up again a certain z-distance, if they "meet" it`s the right object and a combination from itr/kind 9 and bdy works and bring one of the objects to frame 40 and let the other disappear at frame 30 or so .
when the background effect starts make this clone appear, do something and thats it...

This width check works with two type 3 objects, they move up and down the zaxis quickly with hit_j, then move down and up again a certain z-distance, if they "meet" it`s the right object and a combination from itr/kind 9 and bdy works and bring one of the objects to frame 40 and let the other disappear at frame 30 or so .
when the background effect starts make this clone appear, do something and thats it...
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