Question: removing a client page from business manager with no headaches

Question: I am losing a Facebook client at the end of this month. As far as I know, the company I work for created the facebook page for them, so I don't think they've ever had direct access to their own facebook page.

How do we...

1. give them access to the facebook page without connecting them to our FB for business
2. Remove the page from our business manager.

Thanks!