A Typst version that builds to PDF, HTML, and eventually EPUB would be a real upgrade, especially post-FCMP++. Instructional videos on top of that would help too. Worth writing SerHack directly and saying you want to contribute. Check where a second edition actually stands -- he has not been very visible on the book lately. In 2021 he publicly started work on one, asked the community for help updating outdated parts via Google Docs, and called a new edition a priority. The site still takes newsletter signups for the next edition, and the GitHub still lists Mastering Monero, though the last real update there was years ago.