Would like to only have epic available on creation option
Not sure if this is what you want, but you may automatically add a comment on ticket creation by adding an Automation Rule to your SD project:
https://confluence.atlassian.com/servicedeskcloud/automating-your-service-desk-732528900.html
If I remember correctly, the custom automation rule would look like this:
WHEN issue created
IF issue matches <a JQL filter>
THEN add a comment to the issue <desired comment>
Hope it helps.
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