Blu-ray Remuxing

Looking to hire anyone that have experience with modifying Blu-ray movies. I need to add Audio and Subtitle Track in my Language that are extracted from a DVD disc. Must be able to keep the disc structure including menu and all content from the original disc. Also must be able to modify the menu to show the new languages that being added to the Blu-ray. Popular program such as TsMuxer are not compatible with our subtitle language encoding. So we need experience in this to help. We will be paying per title if it successful and will also be paying in a larger amount if you train us on how to do it with the program that you use.