>>6337097If you liked the 3.0's styling, consider dipping into RG. There's really nothing else in the MG line that matches the 3.0's color separation, so unless you're fine with painting it'll have to be on its own.
As for the Musha mkII, if the regular Musha Gundam doesn't float your boat then maybe the Sengoku Astray?
If all you want is subdued designs, then there's plenty of things you could check out. Victory Gundam, GMs, Tallgeese, AGE-1 Normal, and the Geara Doga spring to mind.