You can separate the converter from the receptacle circuit by just moving it in with another breaker, but then you have to look at what would happen on shore power with that and the converter both on.
I couldn't find a suitable alternative to share, so I put a switch in the converter's black wire before it got to the shared breaker. Now the converter and receptacles are still on the same breaker, but I can switch off the converter without shutting off the receptacles too.
(Of course with it in with the receptacles, you also have to watch what you might plug into a receptacle when the converter is charging a low battery so you don't pop the shared breaker.)
Interesting to see there, that the MW has a 20 instead of a 15. Wonder why?