Using reversers to back off the gate used to be SOP for 727s at O'Hare a few years back, I seem to remember. I'm not sure that it would work quite as well with your CFM56s so close to the ground though.
Saw a Sterling Airways Caravelle VI R do this at Manch 25 years or so ago when spotters could walk down the tops of the piers. May have sustained some FoD myself from all the dust swirling about. Impressive though.