Limit access to Wordpress installer for customers

[VirtualCed]

Hello,

I have an offer specialized in WP hosting.
The automatic Wordpress installation is a good start.
As it seems there is no way to customize this installation, I wrote a script using a lot of wp-cli commands to have a better installation.
So right now, a customer order a hosting, I install WP with the plesk app installer, then start my script in SSH.

I'd like to either limit the number of installation of WP to one or to have the installer available to me bu tnot the customer. Indeed, sometimes, a customer start a second WP install as they didn't understand it's already done.

Is there a way to do one of those ?

Best regards
Cedric