Get yourself some DAC like a Topping D10s. This specific model can also convert USB to SPDIF coax or toslink to connect in your receiver, instead of RCA analog.
I'm already using HDMI for 7.1 uncompressed PCM. I need to configure my receiver as an extra display just so an audio signal can piggyback off it. Thus, my desire for a simple USB connection.
I'm pretty sure my motherboard has SPDIF optical out, but SPDIF would be a downgrade since it only supports compressed 7.1 or uncompressed stereo.