Check out this paper from my friend Ronen, and Prof. Fateman, putting Lisp into Excel:

"A paper written with Ronen Gradwohl on Lisp and Symbolic Functionality in an Excel Spreadsheet: Development of an OLE Scientific Computing Environment, August, 2002. (code available on request) "

https://people.eecs.berkeley.edu/~fateman/algebra.html

Implement Emacs Lisp and throw in evil-mode. Now you can run the world's most extensible editor with Vim bindings INSIDE EXCEL!!

Also, Emacs's org-mode implements some basic spread-sheet utilities, so...