Is there any game in town, other than the hydraulic rotary steering damper by Scotts ?
All sorts of combinations of damping patterns can be dialled up [compared with linear hydraulic dampers or the old frictional type].
Ralle-Moto used to have a good "RM1" version of rotary hydraulic, possibly still available on the second-hand market.
It was perhaps rather easier and more intuitive to use than the Scotts (which is okay enough in its own right).
Ralle-Moto nowadays sells its second version "RM2", but seems to be selling kits suited to a smaller range of models . . . not including the Strom!
However, I could be wrong about that, and it might be possible to work around that problem.