Just in case, ASIO is not working with spicetool 2022-10-21. maybe we should wait for a new version?
Only WASAPI exclusive, and shared. what I did to record game audio while achieving low audio latency is IIDX 30 WASAPI exclusive -> board integrated spdif out -> scarlett 6i6 spdif in to line out -> MOTU M4 line in to headpnone out -> my headphones, earphones.
You don't need two audio interfaces, but MOTU M4 DAC is great. but what you need is only a audio interface supports spdif in.
Or use stereo mix. almost of realtek audio codecs have it. but it is analog loopback, so audio quality gets worse.