I worked in an R&D lab and if someone had asked me to do this job my response would not have been printable here. It might have included references to places that never see the sun, etc, etc. I've done my fair share of soldering leads to the pads and vias on PCB assemblies but I would never want to try this.
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Surely it would have been cheaper and faster in the long run to just spin the PCB? I had a prototype board given to me that didn't work. After checking for a bit I discovered that the board had been laid out with the footprint for the processor backwards/upside down. Rather than try to blue wire it they just spun the board and all was right with the world.