The Shanling Onix Zenith XST20 SACD transport DOES in fact decode DSD to any DAC via all of its outputs-- except the USB output. They say it right on their own marketing materials:
SACD with True DSD Output
Designed to unlock the full potential of SACD discs, Zenith XST20 offers a unique option to play any SACD in its true DSD quality to any external DAC with DSD capabilities. Utilizing either I2S connection for full native DSD64 or DSD64 DoP over the Coaxial / Optical / AES / BNC. (Note: USB Output does not support SACD Playback)
My next purchase is likely to be the Zenith XST20 with a DAC that I haven't decided on yet. Either the Denafrips Pontus 15th, or the new Garlubidor Divinity (a sister Denafrips company). The Divinity has a screen and 2 I2S inputs (the Pontus only has 1 I2S input and no screen).

