MQA through Toslink

The Bluesound Node 2 can indeed pass an MQA signal via optical. From their website:

Bluesound Players are a full MQA playback solution. They will decode and render MQA playback up to 24/192. If however you are connecting an external DAC, the maximum output will be 24/96 and MQA processing is not happening in the DAC.

If you have an external DAC that is certified by MQA, you may bypass Bluesound's MQA rendering process in the Bluesound NODE 2 or VAULT 2 and send the pure untouched music bits directly via TOSLink Optical or Digital COAX output for processing by your external DAC.

The ifi SPDIF iPurifier is once such reclocker. It supports 24/192 even through its optical connection and is bit perfect. 

https://ifi-audio.com/portfolio-view/accessory-spdif-ipurifier

The Wyred 4 Sound Remedy Reclocker is another, however, it reclocks everything to 24/96.

https://wyred4sound.com/products/digital-converters/remedy-reclocker

I found a high-quality glass optical cable a necessity to pass higher than 24/96. I’ve used Lifatec glass Toslink cables for years. Nice cables.

http://www.lifatec.com/toslink2.html