I wrote a kernel module to control the backlight and panel enable. This turns the display on earlier in the boot process. It also makes panel power control easy. Source and binary are in the files subpage. The module is loaded by a modified overlay file. I've changed the instructions to match.
A full schematic has also been uploaded and added to the instructions.
I received the charger module. I've decided to replace a cap on the non-Adafruit power converter board to lower it's profile, so I'm waiting on a DigiKey order.