Isn't that option the other way around ?
ie B&O to publish the NL protocol, and the OEM DACs to comply ?
Or did you want a B&O black box with a digital output to USB or TOS connection ?
Yes you are wright
That option could be done in several ways
=> having B&O publishing it's NLprotocol
=> having a B&O black box with usb connection , but in this case the Dac drivers shopuld be compatible with the b&O Black box that leads to have either a Microsoft or Mac Os inside the box
=> A coaxial or toslink connection could also do the job , but my priority order would be Usb 1st, Coaxial 2nd, toslink 3rd because in this order you find more quality /options in terms of Bit and Sampling frequencies