I could not speak to the hook ups for your Marantz so have no advice for you there.

Running the either the M-975 or the M-976 everything wants to connect to the Outlaw then out via HDMI to the display. Displays in your case.

If it were me and the price is not an issue I would wait for the M-976 for the dual HDMI out, added inputs, and updated format compliances.

I do not know what might exist for HDMI switches but it might be possible to run a single HDMI out to a switch that could then output to either your TV or projector. I could see hand shake as well as HDCP issues when using a switch but could be wrong. Someone else could give better advice on switches than can I