I'm treading on thin ice because I've got no concrete experience of this (shout out to seasoned MQA users).
As far as I understand it, you only need a bitperfect stream to reach a full decoding MQA DAC. The DAC will then perform a full unfold. Any software capacity to perform the 1st unfold is therefore not used.
The issue of MQA supported devices all the way through the chain only refers, as I understand it, to the business of the 1st unfold. Therefore it only becomes relevant when using a non-MQA DAC. For example, McConnect app (Android or iOS) will perform the 1st unfold as UpNP source. But in order for this to get to a non-MQA DAC it needs to go to a UPnP renderer (e.g. Moode or Volumio as RPi examples). If these renderers don't support MQA (and, again as far as I know, they don't) then the 1st unfold becomes redundant and you only get a redbook stream to the DAC.
Needless to say, with all my caveats, I am very happy to be corrected.