WI: Hypo had been assigned to read J-19?

At the risk of seeming like a thread-spammer...:eek: This one came up here, & I don't recall ever seeing an intelligence-related WI.

OTL, Hypo (or Rochefort, I'm not dead clear which) was assigned to break the Flag Officers Code, IJN's top cypher. The low traffic, & the complexity of it, meant it was never broken, making the effort effectively a total waste. OTOH, J-19 was comparatively easy &, in the event, contained some real gems, in particular the "bomb plot" message.

So, WI, in the period assigned to FOC work, Hypo instead was reading J-19? First, how do you get the change in assignment? Second, what happens?
 
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