voiceroy A web search for replace aosp system font turns up some leads, including: https://stackoverflow.com/questions/9627806/android-add-custom-fonts-to-system
Aside from that, I doubt most users of this forum have looked into this.
Assuming you plan to do builds several times per month to stay up to date, note that the build prerequisites and instructions change over time as the toolchain evolves. I recently needed to upgrade Node.js for the new adevtool to run.
Don't misplace or leak your signing keys!!