Stop a MonoBehavior from being addable as a script?

I am writing an asset, however I would like to stop the user from manually adding the scripts - rather I would like an interim script to do this for them.

Example:

I have two scripts - we'll call these static and dynamic.

I have a third script which we'll call helper - this will add the static or dynamic script based on what the user has entered into the helper script.

However I would like to deny the user from being able to add static and dynamic to a game object at all, rather just the helper script should be available.