I agree with the rpi / dac hat route as the best VFM DACs out there. I've got an allo boss / rpi4 and don't see any reason to change it any time soon. These can be bought with a lego type outer case and then it's just a matter of loading an SD card with your software of choice. Volumio / Moode etc..
Current system:
RPi + Allo Digione
Beresford Caiman Seg & Dorado powered by 15v Linear PSU
Transcendent Sound Mini Beast OTL
Amptastic Mini-1
Klipsch KG4.5 Speakers with Titanium Diagphrams and Sonicap Cap upgrade
110aH Leisure Battery powers the Mini-1 & Digione