You can buy inexpensive crown molding now that is not wood but looks great and can be painted any color you choose. They can be shortened as you need. If I were you, I'd check out what is available in your area before deciding.
I'd love to put crown molding up (after I paint the walls and the shelves above the fireplace, previous owners painted EVERYTHING the same yellowish cream color). But...
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You can buy inexpensive crown molding now that is not wood but looks great and can be painted any color you choose. They can be shortened as you need. If I were you, I'd check out what is available in your area before deciding.
If it was easy everyone would be doing it. You need to know how to cut compound angles to start with.