I'm sorry to hear about your accident! The Matias Half Keyboard https://matias.ca/halfkeyboard/ https://matias.ca/halfkeyboard/ provides a one-handed keyboard t

I'm sorry to hear about your accident! The Matias Half Keyboard https://matias.ca/halfkeyboard/ https://matias.ca/halfkeyboard/ provides a one-handed keyboard that works very similarly to a conventional two-handed keyboard. It's a system that ought to be possible to replicate on a conventional board using AutoHotKey or on a custom-built board. I've never yet tried one myself though.