You might try to take the elements of the Revised Universal Soil Loss Equation and interrogate the elements within the model to your specific conditions or interests. Slope stability has additional factors such as geology type, faults, strike, dip of substrate, etc. i dont remember a dichotomus classification that involves various combinations of rainfall intensity-duration, soil factors such as erosion, infiltration, stability, topography, and geology factors, and possibly interjecting land use disturbance.
However, of all the data that may be available, soil scientists who classify and map soils to soil series
... element were lost in transfer. The mapping to soil series has many elements that can help differentiate and assess erosion, stability and possible land use effects. When soils series with attributed are mapped into GIS, along with DEM, geology, aroads and other land uses and forest or plant types, and rainfall the basic tools are there to help identify hazard zones