Just a friendly message. I saw this addon in curseforge and it reminded me of what I was trying to do.
I wrote a .net app and scraped wowhead for the quest text and then used a trial on google text to speech to create mp3 files.

The reason i never uploaded this was because the mod was too large with all of those mp3 files. I figured i could create multiple mods and break them up into quests for each individual expansion and that might work but i just never did, as there wasnt a great way to know what expansion each quest id was from. So if it's at all helpful, my project is at https://github.com/CodesMahoney/AudioQuests and feel free to use anything u like.

Dude, thats awesome! And could really help us out with our multilang efforts (for now). Are you still active and willing to have a quick discussion on the scraper part via Discord?