Logitech Wave is like that. It is a rubber dome keyboard and I doubt that the key caps could be transplanted. I would like to try it, just to feel for myself it there is any improvement in feel.
Show Image(http://imgur.com/fcoAP.jpg)
...don't think it worked out that well.
@elef - can you take a shot or two of the bottom of the keycaps on the wave? I'm really curious to see whether modifying the female end to the cherry MX cross is possible. I have some mutilated keycaps from a Saitek board that I was going to experiment with.
Looking at the image in the first post - Perhaps I'm wrong, but wouldn't it mean that you would be pushing the keys at strange angles, but the switch will still need to be pushed straight down to be activated?
If the angle is too steep I'd guess this would lead to reduced life of the 'board, or at least to a lousy typing feel.
symphonic1985 - try a quick search for sugru.