Removing clients as Editors on company license

The agency I’m working for has slowly accrued many “Editors” on the company license, from giving client’s editing access to certain files. We’re looking to remove their editing access on our license so we’re not paying for so many seats.

I want to ensure that the client still has access to the file, that they can edit. If I give them ownership of the file, but remove their “Editor” label on our company license, would they lose editing access to the file? Or do I need them to take the file to their own Figma team and then remove their editing access from our license??