Is it not possible to cheat away that trait?
I use the UI Cheat mod, which is perfect for killing off sims. All you need to do is pulling their hunger bar all into the red, and they will collapse immediately. I try to be a bit more human though (no mod needed), by rather dressing them in winter outfit and sending them outdoor during a heatwave, or summer outfit sending them on a walk during a freezing snow storm. Takes only a couple simhours and it might look better in the family tree to die from a heat stroke than from hunger. ;)