from what i have read modified Selectrics where a pretty common keyboard for early computers. although it came with some majors drawbacks
1-1 key rollover, the keys get locked between key presses to make sure to only press one key at a time, and that is because of the encoding mechanism, so even if you remove the typing you will still get only 1 key rollover
2-Control keys, well those are missing
3-Mechanical to the extreme, it does make much more noise than even a model F, with that motor needed to make the whole thing work and much heavier weighting as well
4-There might be other reasons that i do not know/remember
I guess IBM had a reason to develop the beam-spring switch, they wanted the Selectric without its shortcomings.
Other than that you could do it, and you would not be the 1st doing so, linus tech tips even did a video on converting an old typewriter to usb