I have a magnet in the pad of my left ring finger. This keyboard would likely be uncomfortable for me
I got the same implants after talking to him about it on IG. It barely worked. An array of magnets on the skull would probably work. I had to get the magnets in my ears removed when the casings failed.
My guess is that if this keyboard is released and if you use your fingertips rather than fingerpads to type, you might not have a problem unless you are ticklish.