"My question was mean to be related to the "3-5 times more current" comparing an internal to externally regulated alternator. Any thoughts on that?"
The brain in a std alt is expected to replace perhaps 5% of the battery capacity , and hold the voltage up to 14+ so the lights and blower motors .
They are seldom asked to charge a well discharged batt as start batts DIE if any attempt to deep cycle them is made.
Repeated cranking covers the plates with gas , so the batt stops working for the time it takes the gas to depart, it has not been very deeply discharged .
The V reg of a car alt allows only about 50% of the required charge in any hour (to keep the load & internal heat low.
While a one wire alt can be modified to use an external V regulator , it is far simpler to install a rebuilt 75 or 80A from an early large car, and then install the 3-4 stage regulator.
The old Delco stuff from 70's Caddys was quite robust, and still cheap.