Blind Preview

So, I was thinking about a feature that would be extremely useful, but I have no I dea how it could be done.
It would be great if we could do a blind preview function, where the second display could be used to create, or update looks, and then be able to dissolve into those looks live. Very often, I am in a situation where we are in a live show, and requests pop up that are just not possible without a function like this, as it would look really bad on stage as the look is being built.
The preview would not need to be full resolution, just enough to be able to tell what is going on.

Is something like this possible???


Jason

pixelmad with its multiple on screen mixes has something very similar to what you describe here.