Step 9: The Mainstay
I stapled it from the outside, using a needle to find the tube section and assuring no staples points inside the box.
If you combine the box with a costume, you can let the column intact, cutting the box's cardboard in the way you can cross the box with no access to inside to hold it from below, or adding a handle inside the tube, like if the box itself were you hand. Children may insert their hands without finding yours.
This may be the way I will use it again, this hallowen.