Freo: I suspect the issue here is copy protection and DSD licensing. No one is going to allow simple, in the clear, access to a DSD data stream generated from (copy protected) SACD discs.
The solution is to rip, or have someone, rip any SACD discs which you may have. Once you have the DSD (dsf/dff) files, then playing them with existing hardware is fairly simple.
The legality of ripping DSD files from SACDs which you own is still not entirely clear to me. But, it is probably OK, and covered by what is known as "fair use", as long as you own the SACDs in question, and do not share the files with anyone else.