This is like exactly what I imagined... I'll study this and see if this is something I can do in a few weekends (the answer is likely no as I don't have a lot of hands-on engineering experience, just basics of EE and soldering). Is there any consumer product like this (not necessarily typewriter, e-ink or dumb display would also be ok; I just don't want a full-fledged display that can print images).

Computer distraction is killing my life and I'm currently spending Saturdays as no-screen day (no phone/computer use) but I'd be willing to use a calculator-on-steroids like this as a replacement, which I imagine is not as distracting. (Usual TI programmable calculators are what I'm eyeing right now but their keyboard is not good. I want a usual Qwerty keyboard and linux)