fixed 3 speed

Sturmey Archer just came out with a fixed three speed. That would make a nice fixed bicycle. And there is also a two front crankset. that would give you six fixed gears. than way back Sturmey Archer made a single speed fixed or freewheel rear hub. One more option
White industries has its two cogs freewheels
Plus special hub for fixed riding with a frame with vertical drops outs. to keep chain tension the same when using  two cpgs free wheel.
Thanks
Charles Nighbor Architect
Walnut Creek, CA USA