I have had several SACD players over the years. The latest are Reavon and Sony universal disk devices. The Sony is a pure transport with two HDMI outputs.
The Reavon might as well be a transport because its dacs are unsuitable for DSD - it converts to CD quality. But it also has two HDMI outputs.
You can choose the CD layer, or either two-channel or multi-channel DSD which are not converted to PCM.
Never a problem with HDMI which can transport just about every high-res audio format in multi-channel glory. It was designed as much for audio as for video and can shift 48-Gbps - going to 96-Gbps. Try that with I2S

