Maybe running an additional Runbook Server in the same network/subnet with the folder is an option. As you can run a runbook on a defined Runbook Server this should work. But the Runbook Server service requires to communicate through the firewall with the SCORCH DB SQL Server.
The Runbook Server service could be installed on an existing server in the subnet.
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten