No, I haven't solved the issue.

Yes, sorry for the confusion. This is going to be used both internally and deployed in product.

I have the *.plist files in ~/Library/LaunchAgents. When I try dragging and dropping the files in Files and Folders or Full Disk Access, nothing happens. Is there some other way to set their permissions?

I have launchd and launchctl listed as Full Disk Access. What is DDD?