As long as the DAC can set different output levels in the analog domain beside the digital volume control or has an analog volume control entirely, I'd go with a DAC direct route.
A dCS Bartok has 4 analog referrence settings for its outputs: 0.2V, 0.6V, 2V and 6V which would allow you to gain match your Pass amp and use the digital VC at the top of its range.
A dCS Bartok has 4 analog referrence settings for its outputs: 0.2V, 0.6V, 2V and 6V which would allow you to gain match your Pass amp and use the digital VC at the top of its range.