Reply To: Applying object style to text copy-pasted into template

Rather than applying the object style and then pasting the text, you could start with a simple text frame and then apply the object style.

To make this easy for your non-savvy client, assign a keyboard shortcut to the object style and tell the client “Paste the content, press Escape then [keyboard shortcut].”

That should be easy to memorize and easy for the client to build into muscle memory so it becomes second nature.