I would have thought that the logical MQA compatible replacement for the MS200/MS600 would be something pitched between the two pricewise which offered the following:
...
1 SL outputs with the ability to toggle between MHR on and off
2 SPDIF outputs with the ability to toggle between MHR on and off
3 Analogue outputs based on a 24/192 DAC with some trickle down from the 818v3
4 DSD capable via conversion to PCM
5 A cheaper case than the MS600 more in the style of the MS200 (but larger)
6 Headphone capability
...
Isn't 3, 5 & 6 the Prime?
What is then missing is an MS200 replacement with USB host output and 1, 2, 4