kellysp, let me be brutally honest with you. You are going about this the wrong way.
First you will have trouble finding a receiver with zone 2 HDMI out. If you do find one, you don't want it. It will buy you a ton of grief. The reason is HDMI EDID. Extended Display Identification Data. These codes really dislike what you are doing and to cut a long story short the screens will interfere with each other in strange and annoying ways. You will then be on here posting endlessly.
The plain fact is that you need a receiver in each zone. Then connect a cable from a receiver that can show the same program on two screens, to an HDMI in on the screen in the distant location. I think you will have to do this, as if you plug it into the receiver, I suspect the other receiver will know that the receiver is not an end device, but a repeater device and not pass the signal.
Now you can use ARC, or the digital audio out, to get audio out of the zone 2 TV to the receiver in zone 2.
I would get a receiver with zone 2 preouts, in the main area, so you can at least share audio easily form main zone 1 receiver with the zone 2 receiver.
This is the only reliable way, of getting audio and video to show the same AV program in both zones, and display independent program at the same time in the different areas.
If you try and avoid the expense of two receivers you will regret it.