The producer would be the manufacturer; the mandate could either fall directly on the manufacturer, or just require small businesses to arrange with the manufacturer for recycling.
In my scenario, the manufacturer would have to either provide logistics for local disposal (seems ideal to me) or do their own service (that would be rough!).
I imagine a cottage industry of recycle processing middle handlers would eventually lower the friction in this space.
No, of course not. That's the entire point. The cost needs to be captured _somewhere_ in the private chain because right now it's just an externality that no public entity wants to deal with or can deal with.