Attached is a rather technical paper by Geri Wittig entitled "Expansive Order: Situated and Expansive Knowledge Production in Network Space" which explores the relationship of Luhman's work to Maturana and Varela's as it pertains to social systems. Although it is not simple, perhaps you can draw from it what you need "in translation".
I may have other stuff on this from my doctoral dissertation, but I'll have to hunt it up.
Hope this can be supportive,
Enjoying all the new stuff popping up from this question. Now at home and searching further, this might be my best shot on touching your question - written after reading Ecological Communications.
Not sure I've got it right though... :) Comments appreciated.
Another source: The talks, interviews with Francesco Varela, Maturana, von Foerster and many others on "Monte Grande" and "francisco cisco pancho", two DVDs with a lot of interesting insights and ideas about autopoiesis and especially the shift third person - first person (see O. Scharmer). Deep insights.
All the best,