Why not just spend $140 to get:
1) Raspberry Pi single board computer (RPi)
2) 16G SD card with adapter
3) Allo Digione S/PDIF adapter board
Then the rest is free and only takes an afternoon:
1) Program the SD card with the DietPi OS image using win32diskimager on your laptop - free
2) plug the SD card into the RPi
3) connect power and Ethernet cable to the RPi and power on
4) Install PuTTY remote terminal software on your laptop - free
5) start PuTTY on your laptop and log into the RPi (root name, admin password)
6) Configure the RPi to accept the Digione board by selecting it from the menu after typing the "dietpi-config" command
7) Configure the RPi to have Roon Bridge software by selecting it from the menu after typing "dietpi-software"
8) power down the RPi and plug the Digione to it. repower
9) load the free trial of Roon onto your laptop
10) select the DietPi in the Roon output device or your computer sound output device menu
11) play music
Steve N.
Empirical Audio