the Ghost not actually being Hamlet's father but the Devil trying to bring the family down; it would put an interesting spin on the tension between non-Christian avenge-your-dead-father and Christian virtues in the text, which I see as the engine of the whole plot.

I am less interested in the Devil or a false Ghost, I think, but I agree that I would love to see a production which engages with the fact that while Hamlet's father couches his charge for revenge in Christian terms—confined to fast in fires, with all his imperfections still upon his head—what he's asking for is right out of a Norse saga. And it obliterates the royal family of Denmark. I mean, good for Norway, but I'd like to know how old Hamlet feels about it.