Digital coaxial advice needed

I'm still lost with your request?  You have 2 pc's that you want to connect to your nuprime, correct?  Your nuprime only has 1 usb input.  Why not pick up a SPDIF converter.  One of your pc's will go directly to the nuprime. The other pc will go to the SPDIF and then into either the coax or toslink.  

Seems to me the OP is looking for two power cords and one digital coax. Focus seems now to be the coax. 

I'm very happy with my Audio Envy digital coax.

What’s your budget?

Well, what’s reasonable? I was looking at Lessloss C-marc.
https://www.lessloss.com/cmarc-digital-cable-p-226.html
But higher than that i wouldn’t go. Rather a bit cheaper.

However, i just got an answer from Nuprime and they say HDMI is the best option!?