For production work like that there's no doubt at all, for me anyway, that a modern pro-grade DSLR with Live View and video capture capabilities is the right tool. That's what I used when I was doing that kind of work (my camera was an Olympus E-5, which was terrific at this stuff). The E-M5 is there too, nearly as competent in all ways as the E-5 (except for fast moving sports work, hand held with long lenses).
It sounds like you've made a good decision on what to keep for yourself and what to use for your paying work. Two very different needs, solved by two very different camera systems.
Good luck with your contract! And continued good luck with your M9! 🙂
G