my ereader can run emacs and nethack now fear me
its actually just a full pocket pc on eink now
the only thing I don't have is Libreoffice since I cant get an X Server atm
are there any powerful-ish cli spreadsheeting applications I could take a look at?
Goo Truther 
@lyncia there is also ses , simple emacs spreadsheet. You may have to choose based on what fucks with the eink refresh rate the least.