OMG 🤣 def not gonna wanna wait half a year... Would love to try the text to speech but I don't know how to make that work. You are the grapheneos expert... It seems that much of what's available on Android is not automatically on graphene. Like I can't even speech to text text messages. (I get voice input is unavailable right now when I try) And I don't see any functions in the text to speech pdf file of yours.

On zapstore you can get Sherpa, that's a text to speech engine, and voca, that's a reader app that uses the engine. Voca is very early development so its not yet great. There is @voice app too, but that's closed source and you need to install Aurora Store to get it.

SherpaTTS - Zapstore

SherpaTTS is an Android Text-to-Speech engine based on Next-gen Kaldi using Piper or Coqui voices. Upon launching the app for the first time, it ...

Voca - Zapstore

A simple text-to-speech app that lets you listen to text instead of reading it. Features include dark mode, text sharing from other apps, and custo...

The TTS PDF is just a regular PDF but without page numbers and page titles so it makes listening better.