In a similar circumstance I used 1 x 4 red oak to make a simulated
floor-to-ceiling post at the corner of the doorway (using the 1 x 4s on two
connecting sides so they had the appearance of a 4 x 4 post). . I then
added an 8" moulding around the bottom and top of the "post" using the same
type of wood (and used an ogee bit in the router to give this home-made
moulding some character) which made that part of the post stick out from the
wall further than did the crown molding. Then, I butted the crown molding
to the post.
How about a piece of 1X on the side of the cabinet that runs to the wall. The
die into that. The end of the 1X can be cut at about the same angle the crown
it (not a compound cut, leave the face square with the side of the 1X), but with
margin, following the profile as best you can with a few straight cuts.
If you have a scroll saw, you can leave the 1X long, trace the outline of the
it at the intersection and cut. Not sure how that will look, though
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