It would probably send an image, but the impedance mismatch will degrade the quality., and if it is bad enough, the syncs won't come through and you will get nothing. You can use something like this stuff-
Coaxial audio would be fine if I could find a TV that takes coax digital audio in and then would play it out over the TV speakers. All the ones I've see just have the analog audio in.
I'm looking for a way to play the audio over the tv speakers. I've found digital audio to analog audio convertors but they are pretty spendy. I've even thought about a cheap cheap receiver that would have coax in.