Hokay!
A switched in-and-out-of-service alternator can be fitted in place of the A/C bit you're going to have to go aboot (for BFLs sensibilities) it the smart way.
The replacement has to be very small. For agreement with single V-belt capacity no higher than seventy amperes capacity and it has to charge like a bull with hemorroids at slow engine speeds. Remote voltage sensing, and switchable to take it off-line when you decide.
ND Nippondenso has a lineup of small alternators used on Toyotas since the early nineties. With a pulley swap and USING A USED JUNKYARD IDLER PULLEY this would allow for dead slow idle, in-gear total output of almost a hundred amps. The alternators have INTERNAL FANS and the cases are heavily slotted. These guys are amazingly heavy for their tiny size. Because they have an integral regulator thermistor biased they will charge near 15.0 volts near freezing and only droop to around 13.95 at 210+F.
Such a setup will do a sleight of hand on the older MoPar ECUs but not newer than 2002. The ND will current hog until voltage droops enough for the OEM to slide right on in. It is vital to use one of these rectified WYE alternators to surpass your OEM alt in the low speed performance dept. The ND has a good voltage curve for this.
This alternator is way smaller than your 50/120.
