Changing your keyboard layout isn't going to fix bad habits and the things you have to do to stay healthy (stretching, taking breaks, and strengthening).
I also changed my typing style to use my arms to slide my wrists around the keyboard a little rather than overextending fingers, and I rotated my hands inward about 30 degrees (maybe less, never measured it). I still keep about 60-ish WPM with this method, even at 42 years old.
Anyway, I like the Workman layout a lot, especially that the common move for index fingers is down, and the common moves for middle and ring are up. Great thinking!
Yes, this. I've been typing this way my entire computing life (22 years) and have yet to develop symptoms of RSI from typing. (Note: I have developed RSI symptoms from mousing -- and relieved them by using a trackball.)