Cool. It seems that some of the work on the connection between bond graphs and operads was fleshed out by Coya, here:
"Circuits, Bond Graphs, and Signal-Flow Diagrams: A Categorical Perspective" https://arxiv.org/pdf/1805.08290.pdf supported by work, here: "A Compositional Framework for Bond Graphs" https://arxiv.org/pdf/1710.00098.pdf
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