denjz: man, I never ever paid attention to this chord, even if Ive heard the tune hundred times. Its one thing to come up with "new" chords, but its even harder to make them fit into a tune. Esp. if they are this disonant.
Im only guessing, but might it be som Ebmajor chord (like Eb, F, Bb, D) but in this case, the major seventh (D) is replaced by the b9 (Fbb?). Like Ebadd9addb9 (no third, no seventh?). I also wonder if it could be a C dominant chord (no root), with the major third (E), the #9 (Eb), minor seventh (Bb), sus4 (F)? which is what you mentioned in your original post. I havent checked it out the chords mileu or context, maybe the answer is to be found there?
best, Sandemose