Technically speaking I am not Kentico support and I do not work for Kentico support.
Secondly, both Stack Overflow and the Devnet's Q&As are intended for Kentico community. Although Kentico Support monitors them from time to time, they cannot guarantee a timely response. If you need a help with Kentico, please feel free to send your message to email@example.com.
Lastly, I have not had any further progress on your issue as I have exhausted all my resources on this subject. My suggestion is to submit your question to Kentico Support and work with them. Assuming you have a valid Maintenance agreement, support is free.