You really want Roon on the PC, and the DAC somewhere else. I know the “Computer Audiophiles” may not like that idea, but the computer is a pretty electrically noisy place. In an ideal situation, you’d want your DAC to be networked and far away, but if you can’t do that, you’d want a bridge of some sort. PS Audio makes one (that will run RoonSpeakers soon!), and you can also make one with RaspberryPi or maybe even an older Android phone.
If it were me, I’d build kickass Roon library managing PC for now, and plug your DAC into it. When RoonSpeakers is released and/or more hardware manufacturers are releasing products and firmware upgrades with RoonSpeakers support, make your decision on the second machine.