Schnell asked, "...Has such material been drafted or is this just another bluff?"
I was associated with JWs in NYC between approximately 1957-1977 or so. The days of my "yoot."
The Overseer of the Sunnyside congregation in Queens was Howard Zenke who worked the Service Desk in Bethel, if memory serves. The Middle Village congregation shared the Kingdom Hall with Sunnyside. The Overseer of Middle Village was Mike Smilnak, also a Bethelite. Both congregations had LOADS of Bethelites in various positions, and a handful of local, non-Bethelite family men who were elders and servants.
Having been there through the "1975 build-up" I can ASSURE you that while this "message of judgement" was a common JW fantasy, there was never any actual draft of such a message. This is similar to the way JWs yearned for the "big house on the hill" but never actually moved into it because REALITY kept getting in the way -- the world refused to die.
In my opinion, the "End of Blah-Blah-Blah" tracts don't count: NONE of those were "See, I told ya so!" messages.
The "End of Blah-Blah-Blah" tracts were like an evolution of the assembly "resolutions" of the early to mid 20th century; insignificant to both the (non-existent) "spiritual" and secular worlds.