I have been following threads concerning speaker replacement. I saw people had no trouble to fit kappa 60.7cs tweeter and said it was almost drop-in.
It was a little bit surprising you are having a hard time. So I searched the kappa manual.
According to the manual
http://manuals.harman.com/INF/CAR/Ow...v14Mar2008.pdf
you should be able to remove the housing and bring out the tweeter itself.
I hope that this will help. Keep us informed how this goes. Kappa is one of my candidate for speaker upgrade.