Played in that inversion C-Eb-Gb-B on piano is a BMajb9
Which is why I made a point of specifying the intended root note as a vital part of the definition.
I am thus essentially asking what would you call this C chord... to which my own proposed CdimMaj7 (or the more obscure CmMaj7b5 suggestion) would fit the bill the most of the above. It's just that BBox has apparently never heard of it.
p.s. It's actually never heard of of some quite more straight forward ones either, I might add, such as Cm7b9 to pick just one off the top of my head...