If you are allowed to be humorous, you can make an underground newsletter as there should be a receptive audience since the entire court of Denmark is corrupt. This newsletter would, of course, have to be distributed outside the castle walls. This would be a satirtic piece, like those of SNL and Mad Magazine.
For example, you could have a headline such as Old Windbag Finally Deflated
Then, this headline is followed by a lead line and a back-up quote in the manner of jounalistic pieces. Something like--
Polonius, personal advisor to Queen Gertrude, who seems a bit daft herself, hid in the queen's closet while she spoke with her mad son, Hamlet.
When questioned about the circumstances, the court jester explained, 'It is all very logical. If you were foolsih and given to much talk, would you not want to hide and listen to a madman, yourself? Polonius was given to loquacity and probably wanted for new thoughts.'
[Return to the passage in Shakespeare's Hamlet and find incongruent occurrences that you can use to parody, if you may use this genre of satire and parody]