Well since nothing is said about timing I can just ignore that ultimatum
also, I doubt if shooting someone in the pussy will kill them

My policy in the family is either we all die or we all live

But since I don't have a wife yet, it is hard to tell how I would behave in that situation because it is pretty possible that my relationship will be pretty bad and I will be pretty pleased with the situation when I can kill my wife and stay innocent that way avoiding problems with divorce.

if I can do other tricks I can try to shoot my wife without doing considerable harm, for example, I can put something in front of the barrel to slow down the bullet or try to pick some angle which will make it not deadly or the most clever trick

I would push some pretty heavy big object into the pussy of my wife and then shot it
from outside it would look like everything happened properly accept that bullet possibly would do some injury to her pussy but will not go very far

if my captors demand more bloody spectacle I would fill per bottle with small shards of glass push it inside and then shot it in the bottom
that should make them satisfied enuogh