See my post just above.
You could run RoPieee XL on that device… running all 3 - HQPlayer NAA, Roon Bridge and Spotify…
However Spotify would not run through HQPlayer itself.
To run Spotify through HQPlayer (and apply your favourite sinc-M to Spotify or any other TOSlink source) you need to do the miniDSP solution.
The miniDSP box comes with the USB cable and TOSlink cable you need
It’s just a standard printer type USB cable - type B goes into miniDSP box and type A end goes into standard computer port.
What is your current last link before AES3 daisy chain? Can you share the model?