I recommend, whatever you do with the diode pack, to add a Nordkyn VRC-200 controller. This does not require modifying the alternator. Instead it uses the yellow voltage sense wire to "trick" the internal regulator into following an appropriate multi-stage charging profile. It is simple to install and keeps the internal regulator's thermal protections in place.
The bleeding edge crowd love to put down older technologies - try to put that into perspective. Diode isolators are inexpensive and work
well; the loss of energy is small and rarely has any effect. The main downside is that the starting battery is going to stay at acceptance charge voltage longer than ideal. It is quite acceptable to just replace with another diode pack, but do be certain that it is rated for that 115A alternator.
That said, I have come to think that it is preferable to hard-wire the house bank to the alternator, with a separate DC-DC battery charger
connected to the start battery (which only turns on when the alternator is working). This arrangement allows the alternator to properly, and reliably, charge the house bank. The separate DC-DC charger
can then maintain the starting battery without overcharging. A smart battery combiner is another possibility, which I bought but haven't installed yet; it is not quite as good of a solution for caring for the starting battery. There are long threads that discuss these options more fully so search a bit before proceeding.