A way to use your MP1260R with Roon is using a roonbridge with S/P-DIF output and connected it to one of the S/P-DIF inputs of the MP1260R.
Some further information can be found here:
https://kb.roonlabs.com/RoonBridge
https://community.roonlabs.com/t/hifiberry-digi-pro-endpoint/93473