@benjamo there is no real secure way to enforce the behavior you are describing. It is not possible to allow to “only use and not view” a password. When you fill a password in a page or copy it to clipboard it is very easy to view it’s value (for example, in the browser debug console, by using the network tab to see the password in clear being sent, or changing the type of the input field from password to text).
I understand you would want to limit this, but I think you have a misplaced expectation in terms of the security passbolt (and other password managers) can provide here.