I say sink her as a reef!!! She has been pretty much stripped so the reef prep would not be too difficult.
This way she would live on for many years and provide enjoyment for sport divers and a home for marine wildlife. I have to say here that if she still had her interior decor minus furnishings as I saw her in the 90's she would be a more practical preservation. Unfortunately she is now just a shell, pull out some of the propulsion machinery maybe and put that in a museum and sink the rest!!