I’m in a similar position, running Roon ROCK on a PC into Matrix X spdif 2 USB>I2S into DS. Sounds pretty darn good but wonder how much more a proper server would improve things. Adding the Matrix DDC really cleaned up the USB signal allowing it to become much more dynamic and well cleaner with less treble fuzz.
I too would like to stick with Roon (lifetime), Pink Faun are hand built in Scandinavia and thus difficult to eval in US at home but the/he welcomes returns up to 30 days to allow a trial for the cost of return shipping of course ~$100.
I’ve not been terribly impressed with very many other builds. Many of them are not much more than slightly customized PCs. Pink Faun, Antipodes look well done. Wolf, not so much. Aurender doesn't run ROCK.
P.S. I had Vandersteen 2Ce Sigs for about 20 years. I enjoyed them very much, alas they were too large for my semi-retirement downsized house.