Hi, I played with ARION SCH-1 for many years and yes, it can simulate very well the leslie sound. My "leslie" settings are a bit different: Rate at 1 o' clock, depth 3 o' clock, tone at 12 o' clock.
To my ears this is a good approximation of this sound with the kemper : Vintage chorus module with RATE 8,5, DEPTH 5,5, CROSSOVER 50,6 , MIX 100%, DUCKING 0, VOLUME +1 . I generally use this module before the distortion, this can make a difference.
Maybe you could try this setting and let me know if it works for you, there are also other posibilities (for instance Wah frequency shifter) but this could be a stating point