Earlier quoted context omitted.
Yeah, they've made some design decisions I don't agree with but it is pretty nice all the same. I think you can turn off the wireless with a switch but haven't looked into it as I'm more into paper-output typewriters than reading a small display.
Does this work for you: http://www.usbtypewriter.com/pages/faq It requires a desktop, Raspherry Pi or Android phone/tablet that supports USB OTG, http://www.corsair.com/en-us/landing/otg-compatibility-list Maybe you could use a USB powered hub + hardware keylogger to record the keystrokes from the typewriter?
The use case for me is being able to carry a typewriter around and write on it without thinking about plugging it in to something, then taking a USB key off it later. Whereas that kit is more oriented to using with another computer.
It's also a project that I've accepted I'll tackle some year in the future as my list of fun projects is long and limited by a full time job and a side business. Thank you for the links!