I wouldn't be surprised if something LIKE this happened, or something with SOME SIMILARITIES to this. A MUCH more likely tale:
A brother of the conscious class decides he's had it with playing the Borg game and devises a way to quit with somewhat of a flourish. Decides to use the NIV exclusively both in service and at the meetings. He gives a few comments during the Highlights based on readings from the NIV. Afterwards another elder "has a little talk with him" about how he feels using a non NWT Bible at the KH is inappropriate.
This, in turn, causes the conscious brother to dig in his heels and use the NIV all the more. At his next assigned public talk, just a couple weeks later, he uses the NIV exclusively throughout, causing gasps and fits and discomfort among the true believers in the Hall, with perhaps one or two of the other conscious brothers smiling inwardly.
After the talk, the brother who dislikes him gets a cohort to "have another little talk" with him out back. They self-righteously tell him how inappropriate it is to give an entire public talk at a K.H. without using the NWT AT ALL. He tells them to stick it, and walks out of the KH, never to return (which was his plan all along anyway).
Rumors spread and the one that grows the best legs ends up being the one posted in the orignal post of this thread.
Seems a bit more likely, eh?