NO!!!!!
You have more chance of ruining your life with disability than of CTB.
There's statistically 13-14% chance of success & that stat is from all drugs including fentanyl.
I would find a more dependable means to CTB.
Imagine waking up in a hospital so disabled that you can no longer get out of bed. Not a pretty scenario.
Benzos are a pretty "safe" drug even in an OD.
At any rate, I hope you are able to find peace