I tried to find SN on amazon but the only ones I found that could be delivered here were Sodium Nitrates. A benzo? Like benzodiazepine? I'll have to check on the chloroquine. And how much of that will. I need if I find it?
You may want to look on other popular sites or search google for "buy sodium nitrite" and try to find some store in your country that sells it.
PPH says that is better not to mix benzodiazepines with chloroquine as it can make it less toxic. This have been disputed and other sources do recommend a benzodiazepine.
When using amytriptyline is usually recommended to take a benzodiazepine. Using a benzodiazepine can potentiate the toxicity and make it more peaceful as it will make you pass out.
The avability of this drugs will depend on the country you live. Benzodiazepines will be the most difficult to get, for this reason you may consider SN as it doesn't need benzodiazepines.
I recommend reading the PPH:
https://sanctioned-suicide.net/threads/peaceful-pill-ehandbook-2020.35699/
I also recommend "Guide to a humane self-chosen death". You can easily find a pdf online.