Thanks Ethan, Jeff and the rest!
I finally managed to get it done today. I cut the Neckers handle off with a angle-grinder, bead-blasted the coating away, welded the new handle on while making sure that the blade didnt get too hot to the touch. I kept a soaked cloth next to me and used it to cool the blade everytime i'd weld abit.
After i finished welding i ground most of the excess material away, and spraypainted it black again.
Im quite pleased with the end-result
The increased handle-length is very noticable and it feels much more comfortable!
Im heading off on a 2-day hike tomorrow and ill bring it along and put it through its paces ie. mostly batoning to make sure it stays in one piece, which im pretty sure it will.
Heres a link to all the pics on Flickr:
http://www.flickr.com/photos/km-m/sets/72157618494799941/
Let me know what you think!
Regards
Mads