Not so. A check of Prof. Kelly's videos, and the official GM Bolt parts list shows no different battery for DC vs non-DC. The DC charging is done through the main DC power lines to the battery from the HVDM. As far as the battery is concerned, DC fast charging is just like regen.The battery pack would also need to be modified or replaced, which adds far more expense.
Replacing the HVDM, charge socket, and its wiring harnesses are enough of a pain in the butt. The biggest problem, as Prof. Kelly has pointed out, may be getting the cars software to allow the switch.
GM is probably going to be no help. They even seem reluctant to help people repair crashed Bolts at this point.