The 22SI is the old Motorola linear voltage regulator, I think it was discrete transistors then the MC3325 IC inside, then
CS3341.I looked at more modern alternator regulators and none of them look at output current. Some use nearby rectifier temperature to see if things are too hot, or knowing RPM and field current they model the output current. The industry has gone to LIN serial bus so the ECU can communicate to the alternator.
They all use low frequency 50-400Hz PWM to excite the field winding.
OP could use a hall-effect DC current transducer and a circuit or MCU to control the alternator or make a custom regulator, but these are a lot of work.
I think I would just add some small resistance to limit current.
NXP TC80310 Alternator regulator with LIN (but die only).
MC33099