...If this would work, it's an EXCELLENT idea. As you inflate the yukkuri, it's skin is jammed up into the adhesive on the duct tape tighter, and once it inflates well enough, you can re-seal the hole and torture it without worrying that its skin will burst and die too easily.
Of course, there's the problem if the yukkuri needs to breathe in some fashion, and dies even before you finished inflating it from suffocation.