Digital XLO signature RCA cable : Changing one end to BNC

By all means - USE THE ADAPTER!  You absolutely do not want to cut that cable and put a different connector on it, particularly if it is not absolutely a 75 ohm BNC.

I agree, keep the cable as is. I have been told that by many dealers that would benefit from sending the cable in for re-term. I am using Audioquest adapters with good luck although had I known Cardas made one, I may have gone with Cardas.

Have XLO do the re-termination for and the Oyaide BNC is a very good connector.  If your system is sufficiently resolving, you'll definitely hear the deleterious effects of the adapter. My experience with the Cardas xlr-to-rca adapters showed them to obscure detail and muddy up the soundstage with less precise/indistinct images.