Sounds like a really interesting idea for a Setting! This combination of "Expanse" and a new, second era Adventure! reminds me somewhat about Allen Steeles Captain-Future-Reboot "Avengers of the Moon". (https://books.google.de/books/about/...on&redir_esc=y). This also combines relatively "hard" modern Space-Opera with the pulpy, adventurous Sci-Fi of old.