Don't think its a problem with the shifter, it might be internal, one of the 'key's may be bent. Assume its got plenty of oil in it?
If you can get a small pair of vice grips on the gear spline, try using those to see if you can get into 2nd, going up from neutral-give 1st a miss. Maybe once you get into 2nd you can move up the gears.
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