Because channeling subjects who prove to be non-divine can be dark spirits or physical extraterrestrials, what is the best request to make for the divine realm to bring a healing effort to bear, which will help the subject take a better path and remove this potential troublemaker as a negative influence on channelers?

If you are uncertain what type of source you are interacting with, you can cover all the bases by simply requesting, "If this source is a spirit, send it to the light for healing and rehabilitation." And if it is a physical being, "Bring repeated healing to bear to improve the individual’s ability to find a better path by withdrawing from misconduct and healing the karmic basis for the wrongdoing." A more effective approach would be to do a follow-up Lightworker Healing Protocol session then and there while the being in question is netted in white light but it can be done later by referencing the encounter and the test results and assign that being as the client for the Protocol session. This will be the most thorough possible healing outreach you can launch to both help and remove a menace of this kind from the scene.