Thanks to all. It was very confusing.
I wasn’t sure if I’d have to shelf my MScalar if my upgraded DAC didn’t have BNC inputs.
I’ll probably move forward with purchasing WAVE STREAM BNC cable. I’ll ask them if they will terminate to RCA on one side which seems sonically better than an an added layer of an a BNC to RCA adapter. Although I have a soldering iron, not sure if I have the skills to re-terminate the WAVE STREAM BNC to RCA myself using a high quality RCA connector like from WBT - seems doable.