I have an HK990 and its CD player HD990 connected via HRS-LINK.
I also have a mac mini connected via S/PDIF (M2 Tech HiFace EVO).
HiFace EVO has an external clock input and, reading at your message I had the idea to connect the HiFace EVO to the HRS-Link by building an ad-hoc cable with RJ-45 in one side and S/PDIF and clock for the other side.
Do you think this is possible?
Best,
Davide