As title says, the official GUI is much more useful than the two custom ones supplied with CWP.
You are doing your users a disservice to have removed this vital piece of server security!
The structured GUI firewall configuration guides users through the settings, rather than enforcing them to revert to the command line, to read the CSF documentation.
The preferred option is to reinstate this module and remove the existing custom ones, to save confusion. Perhaps just leave a very minimal custom one, to for example, enable/disable and flush rules.
Thankfully, I have managed to copy across the relevant files from an existing VPS, to a newly installed one. It helps to keep my productivity high and reduce the chance of typos.