Sturmey Archer had 2 and 3 speed fixed gear hubs and a flip flop with two fixed internal gears and a freewheel on the other side, most of the hubs were built before the WW2, the 3 speed ASC hub was built in the 40s and 50s. In the fixed gear gallery there is a Hercules with a 2 speed fixed gear made out of an AW hub, I'm guessing he used the modifications shown on Sheldon Brown's site.
Is Bikesmith still around? I heard they went out of business.