I can run Tidal or Tidal/Roon with the initial MQA unfold on an old laptop or PC, and then output via USB-to-SPDIF device, or via the network, to an endpoint like my 218.

Problem is with our surround units which will not pass MQA to the SE speakers for final rendering, so I have to get up from my armchair to throw two RJ45 switches that toggle between SL sources to the speakers: full MQA from the 218 or first unfold only through the C61R.

I suppose that you could wire the speakers with both SL and SPDIF, and do the switching from your armchair with MSR.

Server: Audiolinux Roon NUC w/HAF room correction and crosstalk cancellation
Theater: 218, Allo Signature, miniDSP, HD621, C61R, DSP5200SEu, 420, 33, NHT subs
EtherREGEN w/Finisar fiber, Shunyata Denali
Living Room: RPi4 Diretta Host & Target, Ghent USB > Singxer SU-6 > AES NA M-Links > DSP9
Shunyata TritonV3, LHY lps, Farad Super3, Stack AUVA feet