CI Affected Notification for Change Requests

Has anyone had any success setting up Affected CI Notifications from a change Request? We are looking to spawn an email to the customers of CIs that are affected by a Change Request after the change has been approved. I have copied the script from the CI Affected Notifications business rule that fires the event for incidents into a new Script Action so that I could fire it from the workflow, but when users try to subscribe to the email the Configuration Item field does not pop for the user to subscribe to a CI. Is there a way to make this work or better yet have it simply send an email to all users in a group field listed on the CI automatically without having the have the users subscribe to each CI individually?