I have no affiliation with this site or product. I have been trying to find where to buy this product for some time now and thought others here may also be interested.
Grandpa Chas S.
NuVinciTM for Bicycles
Working on behalf of and with interested OEM customers, ATC is defining the state of the art for internal hub transmissions and revolutionizing the bicycle industry by simplifying the complex world of gears and dérailleurs for the novice and casual cyclist. NuVinci technology provides an intuitive ride experience that is unmatched in the industry for its ease of use and pleasurable ride experience. NuVinci technology enables the average, non-technical consumer to enjoy the cycling experience without the frustration of trying to find the right gear; with NuVinci you have the ability to ride at "your speed".
You may want to look at this version that has the ability to be driven from the peddles and a motor. The third inner sprocket can be removed and this unit can then be laced into a standard 36 hole rim.