Feel free to shoot any questions re: freighter travel in the mean time and I'll share what I know.
Booking directly with CGM-CMA in Marseille. Be flexible as ship schedules are not fixed.
Looks like it will be the CC Figaro for Malta-Port Klang which has French officers (good meals with wine served at lunch and dinner). CC Centaurus for Hong Kong to Long Beach and don't know what the nationality of the ship officers is.
One thing to watch for is that access to the ship is by gangway to the main deck and that's a lot of steps on any container ship. No holes in the hull for sure. Hopefully a sailor or the steward will help you with your bags but don't count on it.