I understand a bit more know. Yes with the right presentation the numbers at the end would work quite nice. I also think that handling the staple guns yourself will solve a lot of problem and I don't think it will detract from the performance. To elaborate on my thoughts, Not that I am recommending but just "thinking out loud", If I were to add the number reveal to the end of that roulette routine I would add it to a confabulation. This is how I would go about it.
Character-Sleazy salesman that can talk you into anything. Power-Hypnosis, NPL.
Throughout the routine ask a few "free association" questions to get to know the audience. To one volunteer I say "what is the first animal to come to mind" They say "Cat."
To another I ask, " Think of any city in the world" They say "Brussles."
Then, when I reach that roulette routine I ask the volunteer to order the staple guns.
Then after the Roulette routine I act like it's the end of the show. Than as an impromptu encore I mention how even the choices that seemed the most fair, the least laden with suggestions, were indeed the result cultural, and psychological suggestions. Then I open the box and reveal the "prediction."
Anyways, not the way you should present it given what you have said but an interesting exercise for me none the less.
This is what I am opening with, the rest of the act gets bigger and bigger towards the finish I am going to say it was influenced and explain with a clever use of patter and positioning just how I made them select not only the gun I wanted them to select but the order too, after all it was the only way to ensure my safety.
The method is a cheeky method which I know for a fact cannot just be guessed
There are no outs in this stunt!
I might lock the box and get them to sit down with it till later on, that sounds very nice and add it to a reveal of a few things later in the show this gives me time to mess around with some more variables
keep it coming i like thinking out loud every little helps