So for adding Roon to existing Naim equipment, is the SonoreUPnP bridge.
It runs on their hardware (low noise environment, plus you can add a low noise PSU), behaves a full Roon Endpoint but outputs into the UPnP input on your Naim network player, with input switching when playback is initiated.
Works like a treat on all formats, PCM & native DSD.
Also allows you to apply DSP to the playsream, and upsample to max rate or convert to DSD.
No format conversion to S/PDIF & the opportunity to introduce jitter into the playback stream.
I now have the UltraRendu with UpTone UltraCap LPS as a pair (so looks good) into my NDS.
Plus MQA support in the Roon Core.
See SonoreUPnP Bridge (beta) and
MQA unfold in Roon 1.5 over UPnP Bridge and
https://forums.naimaudio.com/topic/sonore-upnp-bridge-for-roon
