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One thing, you probably do need to connect an hdmi output from the receiver to the TV, but only for the times you need to access the receiver's setup menu. There's still no need for a 4K compatible receiver to do that.

The good news is, you already have what you need. Since you don't plan to pass any video through the receiver, it makes no difference what its video capabilities are. So, 4K support isn't needed. Just use the optical output from the TV to your receiver. Done. Also, there is no such thing...