Both HDMI outputs are available from any HDMI input. As long as the video is supported at #'s 5 and #6 HDMI ins, which are not HDCP2.2, then you'd be able to send them out through both outputs just as you would with the HDMI #'s 1 through 4 inputs.
I haven't looked, but there may be third party sales of 976's somewhere. I'm guessing the current chip shortage is hitting the market right about now. So we're seeing more and more out-of-stock models.