There are plenty of stories of large aircraft accidentally, or emergently, landing at airports that don't meet the plane's runway length requirements. The only solution to getting them out that I've read is stripping them to the point that some authority deems them light enough for takeoff on the short runway.
What I haven't read of are the use of any measures to increase the thrust available for the takeoff run. The first idea that came to mind was the use of RATO. Is this possible with civilian aircraft? Is it done? If not, why not?
(My second thought was to temporarily install water injection. But then I figured that by the time a system like that could be tested and approved the plane could have been disassembled for overland shipping.)