I guess bikes with drop bars and hub gears are just too niche. There is one guy in my town who built one up on an old road frame.
The Thorn Commutour from sjscycles.com has horizontal dropouts, spaced at 132.5 (for use with either standard width), and drop bars and is available with a hub gear option on 26" MTB size wheels.
I ride my 3x7 derailleur system in all weather,leave it parked outside, and would never consider cleaning it after a bit of rain or snow. I throw a bucket of water over it every few weeks, but thats all.