mirtazapine does help me more than any/most other meds did. I would try it for a bit before making any big decisions.
I also think about a bag over head plus in my case benzos. I have a more 'cocktail' method but the DIY bag over head feels less pre-meditated and more like something I can do at home.
I think you are right - what is the harm in trying it as a method. If your body stops it happening then so be it, but what is the harm in trying.
But as said, try the med for a while first.