I like it. That would work much better than trying to do the whole, "Make Ben tell the truth". Luke's reaction just wouldn't be believable in either film. Besides, I prefer the idea of Luke starting on his journey after having lost everything, and trough supporting a cause, finds the truth of his father and his own genuine purpose. Having him know from the get-go would ruin that, especially considering how his dialogue to Ben upon his return to the farm speaks nothing of wanting to help his father. It would make his actions in Jedi seemingly out of the blue.
There is merit to this, mostly due to it's unofficial nature. Though having the Emperor merely named is enough. I see no point in adding him.