Might consider converting sacd iso to DSF files as the metadata is embedded and portable in case you want play on another platform. No walk in the park though.
I would recommend against using DSF files. (Despite being incredibly easy to do using Iso2DSD)
.dsf files do have the bonus of embedded tag metafile data, which is stored at the end of the DSD data but there is a major potential problem with .dsf
.dsf is a file format which contains the data in fixed length file packets.
When a .dsf is created, there is almost always a need to add some padding to the end of the DSD data stream to fill up the final data packet. This is multiple zeros. The metafile is then "tagged" to the end
The problem is that this "silent" padding is now part of the data stream so if you try to gapless play sequential .dsf files, the original audio will not now be gapless.
This is dreadful for live recordings or contiguous music tracks where the audio from one segues into the next and although I am not a classical fan, I can imagine it will affect this badly.
Extracting to .dff individual .dff files for each track is also possible with Iso2DSD.
.dff does not have this problem with file padding, but has the downside of not being able to contain metafile data.
Personally, I do extract my .iso SACD backups using Iso2DSD but convert using the third option of the "DSDIFF edit master" file format plus cue file.
This process gives you a single .dff file for the whole stereo or multichannel album plus cue files. It needs to be used separately for the MCh and 2Ch portions of the SACD iso giving you two .dff and two .cue
Note that the cue files usually need quite extensive manual editing for artist and track as it simply contains the artist and track text that displays on the SACD player window during playback and thus is not standardised for capitalisation so looks a real mess. At least a tenth of SACD have incorrect metadata embedded into them with wrong or no artist info and abbreviated or no or wrong track names. Companies were and continue to be extremely sloppy in their SACD-Text quality control.
The reason I extract to dff is that any DST is decompressed so playback is less processor intensive and so playback can be done on any old PC plus my "mp3" played is a FIIO X5 which can playback DSD files (dsf or dff) but cannot decompress DST DSD (a very processor heavy action and certainly not possible on any portable digital audio player)