I've had a look at it. H-code will require a lot of skill and dedication to make, because the text does not exist in memory in any hookable encoding (and what remains is already not used). VinosWinPlayer.exe, the game engine, uses Kirikiri/KAG3 scripts interpreted by JavaScript under CEF3 (Chromium+.NET). And this mess looks really, really horrible in a debugger.
If someone else wants to have a look at it, some debug symbols you'll probably need are available on MS servers, and some symbols for CEF are here:
http://opensource.spotify.com/cefbuilds/index.html
Use "Release Symbols" in "Windows 32-bit Builds", libcef.dll.pdb for this game is under "04/24/2019 - CEF 73.1.13+g6e3c989+chromium-73.0.3683.75 / Chromium 73.0.3683.75"
I suppose the method used for text hooking RPGMaker MV games (RPGMakerMVGame Hook patcher) can be adapted to this game.
player.pkg and data.pkg are password-protected ZIP archives which probably will have to be extracted for that to work. Their passwords are 6Yrdda1ctHmJY6v2 and JICEFPThDbzub1mD respectively.