OK, got it working. For whomever may find this useful, I flashed it back to stock, then flashed the firmware posted by kvgtx12 in Post 91 of the other thread. The screen never blanked, but I gave it a solid 5 mins, then shut off, pulled card, powered on, screen was dark. Powered back off, plugged in BTTPad7/OrangePi CM4 with a different USB cable, powered back up and turned Pad7 on. BAM! KlipperScreen with all parameters and menu options and no errors.
Good luck out there.