To use Current Hybrid Build, I just use English install of the game.
Basically the structure is like this:
Cfg, DLL, adb, Exe are original english files. Modifying data.adb just causes black screen.
Gfx1-Gfx2.grp are original english files, one contains texture files and the other jusy music files, no change needs to be.
Gfx3.grp - modify, contains cinematics, but sounds are placed as wav in the game directory, due to structure you can't place then inside the game files directly. So thus ChatGPT help with wav files which is placed in English Install, will trick the game play those files, like Prologue, Confession and Ending cinematics, the only I change was cinematics chapters to display English subs, also Ending cinematics have their own build credits, but in orginal English Version they just play in the main menu credits.
Gfx4-Gfx6.grp - modify, these files contains voice records of NPC, Samuel lines, so therefore modify the most.
Another files like chr., patch files are original english files, since they don't do much aside from patch file which if place original czech file in English install breaks main menu a bit.
As for old Hybrid Version it contains some correct reading lines like Chronicles Book in Library in Black Mirror Manor, William Diary (With small parts Of Samuel eng audio here and there) Marcus Gordon Diary, Samuel dialogue lines which most of time works, most of time don't.
Current one mostly have correct placement of dialogue for NPC, aside from Ralph is still has eng audio, Samuel lines most of time use correct lines aside from reading Chronicles, William diary, Marcus Diary (they are still eng audio plays in there), remains of eng audio from Samuel here and there.