Its a long shot but as its the top of the steerer tube it may be possible to build up the damaged threaded area with some mig weld then grind back the weld material to enable the thread to be re-cut.
If you were to go down this route then the threading die would need to be screwed onto the forks upside down before any weld was put on. That way the die will cut in the right direction and the existing threads would continue into the new ones. Good Luck
Its a long shot but as its the top of the steerer tube it may be possible to build up the damaged threaded area with some mig weld then grind back the weld material to enable the thread to be re-cut.
If you were to go down this route then the threading die would need to be screwed onto the forks upside down before any weld was put on. That way the die will cut in the right direction and the existing threads would continue into the new ones. Good Luck