It seems to me that CdimMaj7 needs to be added to the chord list. (Don't know how to notate with little circle and triangle)
B7/C contains C,Eb,Gb,A,B with your root (C) on the bottom.
The same notes are included in Co/B, Ebo/B, Gbo/B and Ao/B. But, then the maj.7th (B) would be voiced on the bottom
)BOB
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