HDMI to Beocreate

I'm looking at using the Beocreate as the way to connect a Pi4 to the four audio channels (front and rear for right and left) in my car, and I'm considering running the audio from Pi4 using one of the two HDMI mini plugs into an HDMI => SPDIF adapter, and powering the Beocreate from https://mausberry-circuits.myshopify.com/collections/frontpage/products/4amp-car-supply-switch .

On paper, this looks like it should (in theory) work, am I missing something or is there a better way to do this?


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