Board Thread:General Discussion/@comment-4257976-20190603025026/@comment-26154973-20190606162005

Somebody also asked similar question on KC3Kai discord few months ago, they made https://github.com/JediKnightChan/KanColleEn.

While not widely practiced it is pretty common to proxy this game's assets and/or API responses for modding or offline/sandbox mode purposes (though in theory you can get banned for this, maybe in practice as well, like with Live2D mods IIRC). Phase 2 also added the possibility to inject into client's JavaScript and do modding that way.