5.1 output from a sound card to the receiver via optical can only be done using compressed encoding like DDL or DTS. HDMI Audio is a full uncompressed output without any analog distortions.
What you may lose is the audio 'enhancements' done by Creative software, but that's been outdated for like...
What is asked is a silly thing.
HDMI Audio thru a video card results in a 2nd monitor. So there are options to deal with that
1) Duplicate it with the primary display. Would not be good as the refresh rate is limited by what the receiver can do, usually 60Hz.
2) Get a second monitor for...
There hasn't been 'low level format' for a very long time, like 30+ years.
Writing all zeros on a modern hard drive is enough to clear data without any chance of recovery (except the remapped bad sectors that can no longer be written no or read from w/o special hardware).
You do not need a dummy HDMI plug and you do not need an HDMI audio extractor.
I have 2 DP monitors and an HDMI receiver without any monitor connected to it.
I have the sound directed to the receiver. I have the receiver and 2nd monitor duplicated in the display control panel, so the mouse...