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Here's some programming suggestions on how to do part if it from a chat session with Steven Dove:

You could setup a trigger to send an email when that specific session comes online.

Event Filter:

Event.EventType = 'Connected' AND Connection.ProcessType = 'Guest' AND Session.SessionID = 'SESSIONIDGOESHERE' (you can get the session ID by selecting that session on the host page and getting it from the URL, which is in the format of xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

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You could use Custom Properties for the session to set the email to send to, then use {Session.CustomPropertyN} in the To Email field, same with the notification request. (https://help.screenconnect.com/Enabling_custom_fields_for_sessions)