How to obtain citation metrics for a low-profile journal that is not indexed in major journal databases? I am interested in generating citation-metrics for The journal of the British Association for the Study of Religions using Google Scholar or such tools. (The journal is not indexed in almost any selective database, compounding my woes.)

Is there a way of doing this?
Not a full answer, but I just want to point out that you can to some extent retrieve citations from, for instance, Web of Science (WoS) to journals that are not covered by the citation index per se. For instance, by doing a "Cited reference search". There you will find citations to documents, based on the citation information given in reference list of WoS publications, irrespective of whether the "target" publications (the ones receiving the citations) are covered by WoS.

For instance, when searching for "BRIT ASS STUDY RELIG" (a generalization of "The journal of the British Association for the Study of Religions", which seems to be found in WoS) as "Cited work" I find a ten citations in total to the journal. 

This is probably not completely what you are after, but might be useful to know.