DVI Routing to get Presenter SCreen on Multiple Displays

Got a good one for you ... have you ever encountered this and found a solution via additional hardware or a software setting?
My client has a single MacBook Pro laptop running Keynote that they are looking to feed not only to a video switcher, but also to a 50" downstage confidence monitor so they can see theri slides from the stage when they present.
I know if I set the laptop to not "mirror" displays, I can get the presentation coming out of the DVI connection and the "Presenters Screen" on the laptop. How do I "split" the signal coming out of the laptop so I can have the "Presenters Screen" on the laptop AND on the confidence monitor, but the main presentation be sent to the video switcher which will feed the projection system in the conference room?
Of course, I could get a second laptop, load the presentation on that so I've got another source, but I am hoping to not have to track changes on two laptops or have to advance them both with one staggered one slide ahead.

A video splitter will NOT split the signal going to the laptop screen.
What you might want to try is a displaylink device. The company makes usb video chips...it means you can buy a usb to DVI or VGA adapter and possibly assign the presenter screen to that output. The problem becomes...will Keynote see the third display and let you put the presenter screen on it. I know you can't mirror 2 displays and not the third, so that's not an option either.
hope that helps! I wish I had one of these devices to test on so we'd just know for sure.
The RIGHT way to do this, I suspect, is to use a tower or new Mac Mini, and split the presenter feed. Both of those solutions ALREADY have 2 distinct video outputs, unlike a laptop which uses feed 1 to send to the built in screen.

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