consider: ghost beverly in s4
Oh, I have, many many times.
I like to imagine Ghost!Bev as the anchor streamed behind Will in S4, keeping him from going full Dark!Will. She provides a context for him to interrogate his Becoming into what Hannibal sees in him.
It could be a great counterpoint to Ghost!Abigail in S3, who let Will talk himself into following Hannibal. Beverly could be the voice that lets Will remember the good parts of who he was before Hannibal.