Disney has released edgier fare for decades under other studio labels, Touchstone, Hollywood Pictures, etc. (Who Framed Roger Rabbit? has always been a Touchstone film, even though Roger has a presence in the theme parks.) They don't have to put the Disney label on the Star Wars films any more than they do Marvel.
Let Han be the smuggler he always was, and Boba can be a Riddick kind of guy who has a personal honor code.