To resist torque windup, you have the anti Rotation washers to add so that will bring it out to near the 120.
if combining to more than 120 , they can be on the outside, too, and thinner grip washers inside to be spot on.
or added ti a underlock nut stack so as to stay with the hub.
in addition , you have this hub
http://www.sjscycles.co.uk/sturmey-a...22072/?geoc=us
it offers both a multi speed fixed gear,
Plus , by threading on a normal freewheel , you have a freewheel hub.
Note the threading on the splines ..