This script should be installed from custom recovery (works flawlessly with TWRP 18.104.22.168) like any app or kernel.
After script execution clear cache/Dalvik and reboot.
If any of the apps updated, then the updated apps will be in data/app and needs deleted from there as well.
Apps list may vary depending upon the particular firmware.
Using this script as example you may add/remove any apps in updater-script inside archive according to your needs.
List of apps I delete from /system/app (currently running Cataclysm ROM):
- Calculator (I use Calculator Mem Lite)
- GoogleHome (I use Nova Launcher Prime)
- Music2 (I use WinAmp and PowerAmp)
P.S. I am not responsible for any damage to you phone, you do it on your own risk.