The first I’d do is to create two separate sys-audio's. I wouldn’t want USB sound card’s controller to mess with my internal audio controller. Second, you don’t need to mess with choosing outptus inside sys-audo, you just choose the other sys-audio.
Next I’d do (I did it, actually) is that I’d do it with fedora-37-minimals It works so to say out of the box.
Maybe you can find some additional info here to be useful
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