Thank you for the input. I have looked at many mechanical ones. The keys are still too high /deep. The story goes, I recently had brain surgery and I lost most motor functions in my left hand. I'm training the hand to type again. The elevated/ high press keys are challenging. I did look at the k400. I am concerned that there is no numeric keypad though.
Also, it looks more like a media device and could be a bit small.
But Ii think I might try it. Perhaps get a stand-alone numeric keypad to go with it.