Our Polish friends know their setup far better than I do. Still, I have to assume the incident dealt some damage to the ties, or whatever system is under that crossing to hold the gauge. It would seem like they'll have to dig it up, no matter what.
Given that, would it make more sense to swap the bent rail with a little-used one, maybe from the end of a siding? Straightening it would then become an experiment performed under better-controlled conditions, and its ultimate fate would be less demanding than mainline service.