APEX works on PC, but it's not officially supported.
Why won't your audio setup work on Xbox? I feed my consoles through a HDMI matrix with optical audio extractor into an optical splitter to a MixAmp, GoXLR and SoundBlaster X7, which in turn feeds a PC, Mac, 5.1 speakers, two headsets, two mics, a SubPac and Nanoleaf lights through a network of 3.5mm audio cables, HDMI audio, USB, toslink cabling and virtual routing.
Honestly though, Xbox controller audio with Dolby Atmos is surprisingly good on next-gen consoles for when I use party chat, so my stupidly complex audio setup is largely redundant. But it also works with Xbox...