It is possible , but still suggest RCA to RCA . If you want to resale or change to other device at a later time.
Anything from ISM Onboard and below not different in reproduce through digital.
I had an experience about 75ohm and non-75ohm RCA socket. My cdp digital out was BNC which I changed to RCA for the reason of cable availability. But it sound less lively.
After some search in the net, it looks like 75ohm standard (all BNC are 75ohm) is important to digital connection. I changed the RCA to a 75ohm type, everything improved and I start to feel the cable investment worth the money. Hope this help.