If Internet Radio is a priority for the OP, then a lecture on sound quality probably isn’t relevant here. Obviously the OP has a good system and knows good sound, but the best we can do with IR is 320 bps, below CD resolution and stations that broadcast at that rate are relatively rare. And there a lot of reasons not to want to faff with Roon, which I won’t go into here; it’s enough that the OP stated he doesn’t want to go there.
One of the best IR presentations used to be iTunes. It was easy to choose by country and genre. I used it first when Apple computers were my streamers, and then secondly from Apple TV. Then Apple probably realized that they could monetize this and required people to use a subscription based service such as Tune In. However since Cambridge Audio can still offer excellent free IR via their app then this is eminently doable.
One of the simplest would be to have a PC in the system and send IR by Ethernet, using Tune In, which the OP has already stated he was amenable to using