Email Opt Out page to direct to 3rd party site

Please correct me if this is already available, but we currently have a big need to customize the email opt out settings...more than just editing opt out categories and reasons. With GDPR and many other policies becoming more strict on customer communications, our marketing team is currently revamping their practices to include an Email Preference Center that is housed on our company’s main website. They send all of their emails out of Marketo, so preferences are currently pushing there already. We want a consistent experience and to direct our customers to the same Email Preferences page whether they click unsubscribe from a Marketo email or one sent via Gainsight. If email preferences are all gathered in the same place, we can use our existing connectors to bring that info back into Gainsight and be able to filter our email sends according to our customer’s preferences.