In addition, I also looked at the information and the manual for the Pioneer VSX-920, and it doesn't mention anywhere that it supports DSD either via USB (via native DSD or DoP) or with DSD-over-DLNA either,
except when using a disc player that supports/decodes SACD discs connected via HDMI to the Pioneer receiver. So that means both your sound card and receiver don't support DSD the way you want them to.
From the manual...
When digital input (optical or coaxial) is selected, this receiver can only play back Dolby Digital, PCM (32 kHz to 96 kHz) and DTS (including DTS 96 kHz / 24 bit) digital signal formats. The compatible signals via the HDMI terminals are: Dolby Digital, DTS, SACD (DSD 2 ch), PCM (32 kHz to 192 kHz sampling frequencies), Dolby TrueHD, Dolby Digital Plus, DTS-EXPRESS, DTSHD Master Audio and DVD Audio (including 192 kHz).
It's kinda common for a receiver to only support DSD when connected directly to a disc player with SACD support over HDMI. Do note that DSD over HDMI only works from a disc player that supports SACD playback connected directly via HDMI to the receiver, and won't work from any sort of computer like a PC, Mac, Raspberry Pi, smartphone, etc. from a HDMI port. So the fact that your receiver only supports DSD via HDMI with a SACD disc player is likely of no use here for your intended use case.
Bottom line is I'm honestly not seeing any way you can get DSD working with your setup without either adding/replacing equipment or just allowing MC to convert it to PCM, since both the Asus sound card and Pioneer receiver don't support it this way.