I've been debating the orchid dottyback as well, however, I have a much smaller tanks than you. I have a lot of places for all my fish to hide but I'm not sure how it'd work out. Have you considered a black-cap gramma? They look nearly the same and seem to have a better temperment.
I have seen an orchid dotty in a 50-ish gallon tank with a blenny, anthia, angel and one more that I can't remember and it seemed to get on alright with everyone, though it did spend most of its time hiding in the caves in the tank.
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