Run with "sudo bash edit_display.sh" from Terminal. Requires VS Code installed.

edit_display.sh

#!/bin/bash

cd /Library/Preferences
BACKUP_NAME=com.apple.windowserver.displays_$(date +%F-%H_%M).plist
echo "Backing up plist to $BACKUP_NAME"
cp com.apple.windowserver.displays.plist $BACKUP_NAME

open_xml () {
	echo "Converting plist to XML..."
	plutil -convert xml1 com.apple.windowserver.displays.plist
	echo "Opening in VS Code..."
	sudo code com.apple.windowserver.displays.plist
}
open_xml

VALID=1
while [ $VALID -eq 1 ]
do
	echo "Edit the file in VS Code, save and hit enter here when done [Enter]:"
	read dummy

	echo "Converting the file back to binary..."
	plutil -convert binary1 com.apple.windowserver.displays.plist

	echo "Validating file..."
	plutil -lint /Library/Preferences/com.apple.windowserver.displays.plist
	VALID=$?
	if [ $VALID -eq 1 ]
	then
		echo "Validation FAIL, try editing again"
		open_xml
	else
		echo "Validation OK"
	fi
done

echo "Removing the ByHost-file..."
rm ~/Library/Preferences/ByHost/com.apple.windowserver*.plist



while true; do
    read -p "Reboot? [Y/n]: " yn
    case $yn in
        [Yy]* ) sudo reboot; break;;
        [Nn]* ) echo "Exiting"; exit;;
        * ) echo "Please answer yes or no.";;
    esac
done