I constantly switch methods because I make rough plans for a given method, highlight all of the flaws/cons, read about failures with the method, and ultimately end up discarding it. I don't yet have anything prepared. I'm hoping to get SN soon and change that, and maybe chloroquine.
I am currently (though this may change very quickly) thinking of doing SN with chloroquine OD (maybe combined with amitriptyline) as backup since both are fairly reliable and at least if that failed, I wouldn't end up horribly disfigured and hopefully the damage would be minimal. Essentially because the substance wouldn't fail unless the drug was impure, I vomited before it could be fully absorbed (in which case it would not be sufficient to cause brain/organ damage), or I called for help or was found., all of which I can greatly mitigate the risk of.