"Under the general heading of pneumatology--the study of the human spirit--it is, IMHO, already amenable to analysis."

There is no reason whatever to think that such a thing as "spirit" exists as anything other than a metaphor for one aspect of the human mind. The example you give, even granting that such a thing as "trance" exists, is clearly an application of psychology. Just because astrology and astronomy both concern stars doesn't mean that every advance made in astronomy is evidence for astrology or that astrologers have a contribution to make to astronomy.