Just some random thoughts:
DCS has proposed a new DSD over USB standard which they have demonstrated but not released to public. Mytek has a DSD DAC already shipping based on this proposal. EMM Labs are also demonstrating their implementations. Playback Designs already have their own implementation.
PureMusic/Amarra can support DSD native streams over USB. I think PM even does it on the fly (no manual conversion needed on your side) to PCM.
DSD can be mapped to 24/88.2 which should be better than RBCD.
One way to rip is to use some HDMI output universal players like Oppo or SACD player like a PS3 to convert DSD to 24/88.2 over HDMI, use something like an Atlona HDMI splitter to optical and use something like a Weiss INT203 to take in the optical signal for recording.
Or if you can find an old PS3, get a native ISO/DSD rip.
Or wait for the major companies who have pledged to release DSD versions.