Our client would like to switch the messaging system to email links rather than using the messaging system. Is there a quick way to do this via the templates?
If only the email-based link is required then the Messages extension is not required at all, please try adding a custom Email attribute and set the <a href="mailto:%value%">Contact</a> display format for it. To avoid duplicating email addresses in the listing form, it may also be possible with a code snippet (based on the vendor email).