Hey, just wanted to close the loop here: replacing the charging board allowed me to power the device on again with no other changes, and I have not had further issues. Being cautious, I updated the system controller firmware immediately as I described in another post before using the Anker A2343 USB-C charger again. This version of the system controller firmware (98310017) contains further changes to sysctl.c which appear to solve the system controller brownout issue and I am now able to additionally boot with the charger board unplugged, pins 2 and 3 in the charger connector jumped, and usb-c power as described above. Good news all around!
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