Interestingly I bought my mother-in-law a keyboard back in 1997 or so from an early auction site (not ebay) that had a release and dial that would split the key

Interestingly I bought my mother-in-law a keyboard back in 1997 or so from an early auction site (not ebay) that had a release and dial that would split the keyboard and raise it in the center so you could pick any angle from 0-degrees to about 60 degrees vertical. As a transcriptionist she had dealt with carpal tunnel for years and that keyboard greatly reduced her pain. Sadly, I think it died in the early 2000s and I could never find a proper replacement. It might have been a Keytronic, but I've slept since then.