Using channeling of the deep subconscious for communication, how can we best introduce the idea to the deep subconscious that it can reach out successfully to the higher self to get assistance?

Because the connection already exists, it is simply a matter of formalizing the nature of this ongoing interchange so the deep subconscious understands the levels of the mind and that the higher self is a divine link and tremendous resource for human betterment so it can appreciate that collaborating is an ideal and quite fortuitous capability to implement and work to strengthen.