Video on Onscreen Window and other device simultaneously

I want to see the video of my Nuendo project both on the Nuendo Onscreen Window and a Blackmagic Decklink device simultaneously.
I can use either or, but not both together.
Is there a way to do this?
I use the Decklink to send Video to the producer’s desk, recording booth, screening room, etc.
The Nuendo Onscreen Window is all I need to work at the mixing desk.
I have been using a Merging VCube so far, with RS422 sync and I want to make things simpler.

At the moment it’s not possible, but there’s a new video engine planned for this year.
So keep your fingers crossed…

On a Mac at least it is possible with a workaround, but you have to do some extra work and it may increase system instability. Instead I’d suggest running a parallel video player (video slave or virtual vtr).