Pretty sure you can come up with something

It is the main tool I am using on my N900. My default "Pavlovian response" to a technical challenge is to see if it can be done in Emacs. Often something is already included in Emacs or you need to install a package. If it doesn't exist you can program it with elisp and often folks are willing to help creating something. It has an awesome community.

Certainly not for everyone though, I would not think about suggesting Emacs to Android or iOS users.