@jwildeboer +1 for all suggestions.
But what about the document status?
AFAIR C4 itself is governed by COSS (https://rfc.unprotocols.org/), and if you change C4, technically it will would become deprecated and eventually retired.
But COSS has never left the draft state :D Do you remember what the ideas behind unprotocols were and why there is a split between unprotocols and ZMQ RFCs?