I'd actually go softer than that.
None of that actually works. Keeping the drugs out of the prisons is damn near impossible and cracking down on addicts just makes it harder for them to re-enter society.
My thoughts would be:
Step 1. Crack down on vagrancy, crack down on panhandling, crack down on being high in public, crack down on the gangs who are dealing the opioids in the first place. Make being a drug addict suck. No more tent cities, no more chatting with the gang at the old safe injection site after easily scoring in the safe-dealing zone. No one quits a drug when they're enjoying it and it's a fun part of their day.
Step 2. Provide opportunity. The real impetus to quit a drug is the idea that life will get better. Job, food, beer, housing. These things need to be a realistic fantasy for those who contemplate sobering up.
The thing about someone who is suicidal, even when (especially when!) they're doing it in slow-motion is that they need to be convinced that things will get better and they're in the middle of a short-term crisis which will soon be over.
Make being a junkie unpleasant and provide a more pleasant alternative. A decent future.
That's all we need to conquer the epidemic.