I may have been the one to ask a somewhat similar questions in that I have at present an overhead projector and plasma TV both HD but not 4K. At present I do have one 4k input (TIVO) and a bluray player (HD) to the pre-amp. I would like to ensure the ability to play either of the 2 inputs to any of the 2 outputs. The response from Outlaw was maybe/maybe not for the 976.

At some future time I plan to get a 4K projector and a 4K TV which means I will have the same issue as you do. You probably should pay attention to the issue of the length of your hdmi cable to your projector because the longer it is the greater possibility of handshaking problems.