Your assuming access to "hospice". Imagine a SHTF environment where that option did not exist.That's because it is a morbid topic that most people don't want to talk about.
I have thought about this, but I wouldn't depend on a chemical to exit.
I preach about hospice and what they actually do, and hint about having "keys to the exit-door".
The end doesn't have to leave a 'mess' for others to clean up either.
When the day comes that my usefulness has ended and my only future is to be a burden on others, a short walk across the road and into the field, and no mess to clean up.