One "solution" may be to just use an HDMI splitter on the Zone 1 output to get the signals to the back patio. Of course, the obvious limitation is that whatever is going on in Zone 1 will have to be happening in Zone 2, but, from previous experience, it's not very often that people in two separate living areas want to watch TV at the exact same time. The people are either on the back patio or in the living room.
Of course, I can understand the need to want to watch TV in the living room and listen to music on the patio, and for that, I would hook up a media streamer (WDTV, Apple TV, anything that can access your music...) via optical audio (and HDMI of course to account for Zone 1 media). My understanding is that the built-in apps on the receiver can be sent to any zone...in other words, you would natively be able to listen to Pandora on the patio without any cabling other than the speakers.