The sram hub uses 3 spline, so you can use 3/32 sturmey sprockets, issue is, they don’t want to shift! They have no ramps etc, so, the easier thing is to buy a sturmey hub bwr, then you have 12 spline, can fit loads of sprockets including shimano ones..
I don't know why I said a SRAM hub, I do indeed have the SA BWR hub. Ok, so many Googlings later, the sprockets for the 3-6 speed SA are 2mm thick. Shimano 9 speed are 1.8mm, SRAM 2mm.
Going to have a hunt around for some cheap as chips sprockets :0)
The sram hub uses 3 spline, so you can use 3/32 sturmey sprockets, issue is, they don’t want to shift! They have no ramps etc, so, the easier thing is to buy a sturmey hub bwr, then you have 12 spline, can fit loads of sprockets including shimano ones..