Personally, I'd make Concentration focus on a single entity, rather than a form or magic or a pantheon - basically, it would be the "Devotee"-style restriction - use no magic (from another Otherworld entity) except from your Patron Saint/God/Great Spirit/whatever.
This would allow much more leeway in "mixing" the magic of pantheons. So you worship a God and he worships a Spirit and she worships a Saint - they are all in the same pantheon, you're all friendly towards each other (at least as friendly as any family/clan/tribe is), you share rites and holy days with each other, You band together against "them heathen furriners", etc.
That's what I would do, if I ran the Zoo.
RR
He was born with the gift of laughter and the sense that the world was mad
R. Sabatini, Scaramouche
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