I've done this before by accident. If you've simply bent the exposed metal contacts away from the cable, super glue them back down and then very gently scrape any glue residue (after it dries) off the exposed contact sides. Do this very, very lightly and only as much as is required to make contact. In fact once you get the leads glued back down, it might be wiser to simply use a very small amount of acetone (like, a single drop) on a cotton swab to clean any glue residue from the exposed contacts, rather than scraping. They are very delicate, and will break and or peel off the ribbon very easily.
If trimming the cable is necessary, you're going to have issues as you try to trim plastic off to expose new contact points, as the metal is going to peel from the backing very easily, and you'll find yourself trimming and trying again, only to have the foil peel again, and next thing you know your cable is now too short and you've wasted a lot of time. In the event that you need to trim the cable, I'm not sure that there is a viable solution, except possibly to try to trim to expose new leads using a razor.
Obviously your best bet is to just buy a new cable. If you try to use a chemical aid at all like acetone, be advised that it will chew through plastics (as it will the glue residue) and these cables are obviously made from similar compounds, so be very careful. Also, obviously take into consideration all of the safety requirements of handling hazardous chemicals (ventilation, contact etc).