@All
Got a new PCIe sound card as the author of the driver (geennaam) suggests Sound Blaster Audigy FX. That one cost in my local shop 50$
The process of installing card and installing drivers was problem-less in my x5000, and everything works as expected. I noted everything in the video:
https://youtu.be/iGE1Hm1LF1IThe real hardcore "Testing" part starts from 3:55.
There are few photos of ones who in interest. All links are clickable for full size.
Box and card:

Front and back (can be seen that Model Number is SB1570):

Inside of x5000 and AHI settings:

The only issue I have (and I do not know if it issues with the driver, or with aeon's ahi-prefs) - when I hit "play test sound" 2 first times, that didn't works, and only start to works from the third time.
On the video, that issue can be seen from 3:00 till 3:30. In those 30 seconds can be seen that I hit one-time play sound in Unit 0: no sound. Then in Music Unit: no sound, then back again to Unit 0: and then sound here. Once I save it all, sound always here on startup, all good. So that why I think it can be something as well in the AHI prefs too.