What makes you think that pasting passwords reduces security? I'd say it is the opposite actually.
Not being able to paste a password means that a user would have to type it in manually, which tend to result in
- simpler and shorter passwords so they will be able to remember easier and enter faster
- if password strength is enforced, users would tend to write the passwords in text files on their desktops and/or on sticky notes around the workplace.
This is what reduces security.
A common way to avoid this is to store passwords in an external service / on a media - be it a simple Chrome password manager or some dedicated app like LastPass / Bitwarden, 1password - and allow the app to auto-fill the password for you.
"There is no free lunch", they say, and password managers have their cons / disadvantages too, but it's generally a way safer approach, and it's a security administrator 's job to promote / spread the culture of using it in the company.
After all, if not being able to paste passwords could increase security, you would likely not do it on most online services, or, at least, have an option to disable it.
