As @chKaze mentioned you have been provided with several suggestions and solutions to your problems, you just don't want to take any of them or put in the work to customize it to your work flow.
Another suggestion would be using something like filebot to process your desired files into a separate folder with hard or soft links and having that folder be the one that btsync syncs.
Part of managing a server by yourself is dealing with issues like this on your own and these problems are not always clear cut or previously documented. Self-management is a challenge and not for everyone, though I as much as anyone can understand the appeal of saving money. However, that said if you want customizations delivered to you on a silver platter, that type of management costs money and there are several providers out there who can provide you with that experience