Off hand, I'd pull the copper rail, cut all plastic tie stringers on the outside rail's side, feed a piece of music wire (square stock?) into it to stop tube collapse and bend rails in a vice, hammer taps, etc. Maybe remove one or both rails? Bending slightly and alternating between two rails and adjusting cut ties as you go might be OK (gotta trim the outer and center rail to match the inside rail length; it will be shorter). I'd remove the outer rail, if need be, to fit a vice's jaws; it has to be moved around anyhow.
Alternatively, a track bender can bend in both directions