hello,

I don't know if it is possible or good enough, but you can try to devide the picture or film, so that the center monitor shows only the half part of the media. There is a visual effect (a mask-effect) to do that...

And then it could be possible to play with the offset-parameter in the mix-window to put both parts (projector) together.

maybe a solution... figured it out

best wishes
saoirse