It will work but it won’t see your DAC it will see the bridge as the Roon Ready output that’s all, it wont have any idea of the DACs capabilities anymore as its not connected to the bridge or core via USB like your using now. Spdif or AES are one way out of the bridge they don’t communicate back. You will also be limited to 192/24 as that’s all Spdif can take. Why not go for a bridge that supports USB like SoTM or Sonore bridges or the Allo.