I like the Chief Coroner idea - especially if William gets some sort of matching promotion!
Also, I don't get why people are so hung up on throwing Julia back in the morgue as the only way to get her working on cases with William again when the title of this thread is..."Julia should have the world's first private CSI lab".
There are already police CSI labs emerging in the world at this time. They are not unheard of or ahistorical. The world is ready for Julia to go into business for herself or perhaps teach a course at the university as well! (The same university that wouldn't accept her as a female student!).
There it is: Julia doing science. Julia working on dead bodies, playing with test tubes and beakers, working closely on cases with William again. Best of all, this is a professional venture and could be construed as a promotion for Julia rather than a demotion to the morgue - which, as Emily's position shows, is sort of an entry level job!!!!
Also, people do not realize they have fanfic imaginations. And those imaginations need to be spent on writing fanfic.
What that means is that the ideas that seem so perfect and romantic in our heads tend to stem from archetypes in the collective unconscious and thus also tend to be rather cliche'd if they are represented to us on screen. Those kisses we swear we want to see over and over again really would be boring after a while if they were just random fan service and not necessary to any plot or new character development. Certain lines and situations become highly cliche'd. I can't stand the "I just want to be held" line at the end of Snakes and Ladders because I've read so much fanfic from several different fandoms that a line like that just makes me want to fall off my chair and go splat on the floor from cliche ennui - I feel almost embarrassed for the writers while listening to it. Though it seems they got away with it because of a relatively older audience that was less immersed in fanfic and thus weren't instantly sick of that line before they even heard it. Another example might be (fanfic writers please take note) saying a kiss, hug, or sexual encounter "felt like coming home".
We think we want to see fan service scenes - but when we actually see them, we realize they are superfluous and detract from the story. We think we want to see happiness and joy, but these things are like flat soda - the fizzy bubbles come from dynamic tension and angst. (Though William might be an exception here: he smiles so little that it may actually count as a dynamic moment of tension when he's happy!). Julia in the morgue is the same thing. We've seen it before: we know we're comfortable with that. But comfort won't pique our interest. Comfort is actually yawn-inducing. MM is best when it takes us out of our comfort zone.
Let's look at the reasons WHY we want Julia back in the morgue - then the options should start to open up.