If we know a person suffers from a major chronic illness like dementia, or another type of dilemma, can we ask for an additional subconscious channeling to be done to address it specifically, and thereby hasten its resolution while at the same time reducing the pace of a decline?

Indeed, this is a brilliant addition to your protocol. To have the additional request made for serious chronic issues so that they are addressed on an ongoing basis, regardless of the whims of the subconscious from day-to-day in what it’s feeling and perceives as its greatest issue. Being a less sophisticated level of the mind, it will not always look for the long-term highest and best need to focus on, but will go where the pain happens to be greatest. And many times, the chronic illnesses are so much a part of everyday experience, they are almost taken for granted. Their slow progression, as well, and the gradual worsening do not raise huge alarms on a regular basis. So to have within the instructions the spirit team addressing a serious chronic issue on a regular basis in this way is a true godsend in targeting as frequently as possible the backlog of unhealed karma that underlie almost all such conditions. And this will help to speed recovery.