If the DAC is 10 meters from the MAC then why not get a second hand Airport Express or even a Raspberry Pi running Volumio which can either output to USB or carry its own DAC ?
cheers
PS. Thank's to you, I have just realised that my 2014 MBP has an optical audio out !! Just tried it and it is also limited to 44.1kHz which is the same as the Airport Express. To better that you would probably have to use the USB out of your MAC, into a Coax/SPDIF converter (TeraDak ?) and into the Beresford if it doesn't have a direct USB input.
PS2 the above is my exact setup in my office. I have a Beresford hooked up to a newer square Airport Express. Quality is great but I do hear some clicks now and then. The older Airport Express (the one that has the plug on it) I have in my main system doesn't click with the Beresford.