Stand down - found my own answer. Didn’t remember seeing it in the extra keyfiles, but the first one by Kolbe had it. For reference:
SimHsiCrsIncBy1 -1 0 0X33 2 0 0 1 “MAIN: HSI CRS Knob - Increase (1°)”
SimHsiCrsDecBy1 -1 0 0X33 4 0 0 1 “MAIN: HSI CRS Knob - Decrease (1°)”
-Babite