If anyone is wondering about the status of this: it's not abandoned. It is, however, going slow due to me being in school. So while I'm not abandoning it, it's gonna be a while. The school year has about a month left, hopefully after that I'll have more time to do this. And without the stress of school I should be able to do a better job on it than I would during the school year. So hopefully over break I can get stuff done on this (at least until school starts again), but obviously no promises.
You should be able to just add dialogue.tlk into the app data folder and run TSLPatcher from a PC and it should work, correct (although I haven't tested). Note that iirc the Android app uses a different audio type so custom audio won't work. But everything else (text dialogue, textures, modules, etc) should work. Although if you use a dialogue.tlk from a PC version, you will have the PC versions of some text (specifically some settings have descriptions that have been adapted for mobile controls, so a PC dialogue.tlk will give you the descriptions for a keyboard and mouse).