So I noticed that pressure advance settings get applied to the target extruder but not to a defined extruder_stepper that is synced with the active extruder. In my case, where the extruder_stepper is between the active extruder and the hotend, this essentially means no pressure advance.

I know you can't pass the extruder_stepper config name to SET_PRESSURE_ADVANCE with the EXTRUDER parameter. Is there some other way to do it?