Maybe they'll fit! I guess I'll just have to try it.
trying yourself is always the best....but one thing to remember even if they are attachable; all things being equal, BMX plats are typically much wider than touring and track pedals. This will put the cage clip too far forward for proper foot placement.
Thats not to say that if you have small clips and big feet, it wont work.
Also, most bmx pedals (that i've seen; I'm not BMX pedal expert) are fairly hollow on the side, may get some undesireable movement of the strap. i say ditch the clips anyway.