Would there be a greater success rate by would-be channelers in developing ability to channel the deep subconscious mind of themselves and others, than in channeling the higher self or Creator, as the latter are in the divine realm? Can more deep subconscious channelers be trained to do healing work than channeling high-level beings?

This is an important insight and is a reflection of your own creative thinking, which we let happen rather than inspire you, because we knew you would think of it. It, indeed, is much easier to channel the deep subconscious of a human being or other being in the physical, than the divine realm. Human beings have total freedom and so are unconstrained to do anything they choose, for example, being approached by another human wanting to interact with them. In contrast, divine beings have many, many, rules of engagement they must follow, so there are greater barriers to answering a divine outreach for any number of reasons. People may simply not be ready to make the best use of an interaction with the divine directly. So this could get complicated in a hurry and create problems rather than solve them despite good intentions for the outreach. There must be a good fit, there must be a lofty purpose and there must be a basic capability to be stable enough and have enough discernment to use divine input wisely and not get derailed because of inner discord or it being too great a reward for the ego, making the enterprise backfire in getting the person into karmic difficulty with divine help. This is the major reason people cannot channel the divine realm. It is because the divine realm knows it is not safe to engage with them because they are not ready for any number of reasons. But talk among humans is fully allowed and the same is true for an intuitive communication. It is human business, and there are no barriers. So this can be fully supported by the divine realm as long as it is not done to exert power and control over someone. If there is a good purpose, it will be fully supported and even encouraged if the person, particularly, has a healing intention in mind. So this is a much easier starting point for training would-be channelers than reaching out to the higher self, which would be the second-most forgiving and feasible of targets, leaving aside the question of channeling dark spirits; for example, those attached to a potential client. That, too, is straightforward and easier then reaching divine-level consciousness and getting an answer. But it has the complication of a premium need for safety, so it has a greater risk involved. Not everyone is interested in talking with demonic spirits, and this we understand. There is much cultural conditioning behind inner fears of taking on the darkness. Whereas helping people with their difficulties is more within the comfort zone of would-be humanitarians. So this is a fine idea and indeed, there can be successful channelers of the deep subconscious who go no further up the chain of command, so to speak. But it is likely that those who start with the deep subconscious and become quite adept and achieve a comfort level in doing so, will have no trouble moving on to the higher self of their clients and themselves, as well, because they will, by then, have learned much about the mechanics involved in maintaining safety while doing it, and will have a confidence level that is necessary for mounting the requisite belief in the fullest sense. That is always a necessary ingredient in reaching the divine realm to get direct feedback.