If its good information and you can make it work for full suspension, Maybe Citric acid with Baking can work as a DIY anesthesia to induce unconsciousness-- But don't worry as your body weight will be enough to compress arteries making you pass out within 20-30 seconds and then painless unconiousness filled by seizure/stroke) But perhaps with Citric acid and Baking soda you can remove that time to 0 Seconds and Hang in peace
Here's some information about it:
NSFW - It has pictures of a dead body, so beware (Citric acid+Baking soda)
Another case of this (No Pictures)
Just trying to help out, I have heard dry ice in a bag could also help the same way - If you're worried about the Human alarm response it should be overridden if the Co2 is confused by the quick transmission of Oxygenized air to Carbon dioxide In which the brain can't account as fast for- That is the same case that happens with swimmers sometimes dubbed: shallow water blackout etc.
Here's some stuff on Dry ice:
https://pubmed.ncbi.nlm.nih.gov/35642774/ (No Pictures of Bodies)
(NSFW) This does have pictures of people who died from this:
https://www.semanticscholar.org/pap...-Lee/60a904250597aaec43ad7f5b45370e26bc6c036a
Just some little information - No bodies
Well whatever path you take man, Good Luck