HDMI to the TV and optical to the receiver will work. Since you are already limited by the fact that you are using optical in the first place, this won't be much worse than optical to the AVR. With this method, depending on the TV, yes, you may have to have the AVR on all the time. That's how I have my parent's system setup because their AVR does not have HDMI either and they do have to have the AVR on because the only setting to get the sound on the AVR shuts off the TV's speakers.