For women I have thought up the keyboard
Long nails inconveniently on the usual keyboard press-washing more conveniently
Worthwhile idea. Needs validation though.
Have you created a mockup and let women (with long finger nails) use them. Also you might want to observe women with long nails (how they are using the regular keyboard and keaypad. My guess is that they are using the keys with the soft tissue of the fingertip and avoiding hitting the keys with their nails altogether. (but then what do I know, my wife does not have extensively long fingernails...)