Great, I think you've set two key conditions that we want to be able to communicate: multiple interactions, and information. And, yes I agree it might make sense to start with the EMF diagram.
In the EMF model of the CE there would also be information, so we still need to come up with an idea about how to convey that this is open.
Re your comment: "I mean the whole left part of the diagram I never really got. But in general: If you run through the butterfly diagram" on Facebook.
I think this is also a really good observation and something that I knew in the back of my mind. To some extent the EMF is dealing with material flows on the left and product flows on the right, which isn't very consistent.
So, a question we should think about is, do we want to think about material flows or product flows? I think it's the latter. In which case, food (i.e. a biological nutrient) would often be transported in a package (i.e. a product / technical nutrient) making me ask if it is logical to separate these two systems?
P.S. I love this sentence: "free knowledge enables circularity and free circularity enables to build more free knowledge to enable circularity."