I'd agree then to call it an E something rather than G7/6 -which would mislead/confuse me more than Em7b9 (which I agree is against all the rules (:)? if I saw it in a chart. I'd be interested to know which note(s) the melody emphasizes during the 2 beats or whatever the Em7b9 is tagged for. That would help me understand what to think about/play with when learning the tune. I'd be tempted to think of that F as a suspension of a C chord, but take pains to omit the C.
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Peter Crist