It just dawned to me some of the things you mentioned and I may have this part wrong:
- It appears Unbound is constantly monitoring this file. Unbound seems to recognize the changes and accept the > A and PTR records.
- NOTE: I began my tests by manually entering file and they seem to be accepted fine.
- NOTE: I still have testing to do to make sure this works properly!
- NOTE: Unbound is the part that worries me the most since I don't understand why this works! I need to keep testing by removing/adding the unbound reload code in the existing bridge!
Back to the drawing board!