I think so but I have not done it so I am not sure how it would turn out. My main concern is the grounding between the existing circuitry and the new, added, circuitry.
Several people were planning t do this with the original RAKK dac but I never heard if they had succeeded. If someone has done this, please let me know how it turned out.
If you get serious about the project contact me and we can discuss the details.
Dave