Well seeing as everyone is doing there own Ghost Trap holder-type-thingy… thought I might as well give you what I worked with this weekend.
Putting the trap into Prop Mode- activating it to the end of the cycle was where it remained so the yellow and both red LEDs remained active.
I then attached the following around the neck of the trap handle;

…then attached around the belt- total size, once attached, was about 4" to 6".
Afterwhich I attached the trap pedal as in the movie.
This remained with the loop hidden (as it was black and behind the pedal) solidly in place for the entire time out-and-about in mass crowds and drunken idiots.
Cheap, effective, need for a mod to the trap and no need for any other (visible) methods to hold the trap in place.