In theory you can do it, but in practice it is a lot of a pain. This is because LCD signals are complex multi level signals and they take a lot of fishing out.
I did an article back in 87, .... BB 52 (Nov. 87) How to tap into LCD displays. A link to the text is here:-
http://www.doc.mmu.ac.uk/STAFF/A.Wiseman/Acorn/BodyBuild/BB87.html
Attached are the diagrams
BBC52D.pdf (70.4 KB)