Hey,
I have a feeling this idea may have some merit. With MIDI being a category I believe this also means I2C as a function should be a category. There are many modules that include this including The new Big Genes (Ksoloti Based) many 16n and 8n slider units, the Monome Teletype and others.
It would certainly help me in my search for utilizing this incredibly interesting protocol in the modular!
Thanks for listening.
Jordan