And, unfortunately, the Sono Hana games don’t use the NScripter engine. I think they might use the KiriKiri2 engine?
could be depending on the period those games were released, KiriKiri is definitely an interesting beast as you can't really interpret the KAG scripts directly as there are dozens of plugins that modify the things available in it due to the interpreter for it being written in TJS and that being interpreted by kirikiri. for F/SN I know of https://fatestaynight.vnovel.org/ but that uses an interpreter specifically written for it.
What I can say is that you should be able to extract the .xp3 archives with AETools (I don't know why; but this single program is a godsend for extracting VN assets).
Another thing is KiriKiriSDL2 which is a port of KiriKiriZ to SDL2 with goals of supporting platforms such as linux and webassembly; but last I heard the project wasn't ready for running games like Fate.
I don't have any online repo that people can use, but I have this post on my home instance where go over some plugins I use too much and additionally I have the following settings to make vim livable for me:
the rest is mainly plugin and filetype configuration which mainly revolves around setting up LSP and resolving some key conflicts as well as making sure CoQ is loaded up as that this is a masterpiece even without LSP ~~(think of CoC; but actually responsive on anything older than a 12th gen CPU)~~