....is not the same as Coast Watchers.
http://home.st.net.au/~dunn/sigint/coastwatchers.htm
My point being that a message would not have "Agents Reports" as a title it would have "Intelligence Report" or "Intelligence Update" or whatever as the initial Coast Watcher report would be directly to the Allied Intelligence Service for analysis and verification etc. Then the Allied Int Service would send out an "all-points" bulletin so to speak to alert Allied forces or send a message directly to the unit(s) that would need the info, such as a submarine.
The report would not refer to "sources" as "Agents" as Intelligence relies on protecting sources to avoid compromise regardless of codes or cryptologic protection.
This mod is a great idea I'm just pointing out possibilities to make it more historically accurate.