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Canonicity: Indeed, none of those items is part of the Western canon of scripture. But I understand that Ps.151 is in the Septuagint, one of the foundation stones of the Western canon, and that it is accepted as canonical by churches in the East. (Analogously, Psalms 152-155 are found in some ancient translations of the O.T. scrolls.)
Consistency of the template: My original question was solely about consistency of those items in (and not in) the template, not about varying canonicity of the items. In that sense, my earlier question was deficient.
These aspects are linked, of course. So I should probably reformulate my question into two, to account for canonicity:
Consistency: Given that the template includes Psalms beyond the western-traditional 150, shouldn't it also include Psalms of Solomon? (Note: consistency.)
Canonicity: Given that the 150 have universal canonicity, whereas the other items don't, should we re-structure the template to reflect this? (See, for example, the 'Deuterocanon & Apocrypha' section of Template:Books of the Bible?