The Lenovo N5902 wireless handheld keyboard can be said to fit this role to a ‘T’, where each feature on the HTPC keyboard has been scaled down in order to fulfill ergonomic and usability concerns. This second generation model shares an interesting paddle shape, but with backlighting, it certainly goes a long way in making it so much easier to type.
There is no more trackball as well to worry about (alongside cleaning it from time to time) as optical finger navigation will replace that hardware feature. Lenovo is asking $51.99 for this puppy – are you willing to part with that amount?