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1) Can't help much with the dev. env., I got it working easily by using the wiki article. Might seem like your Java JDK might be faulty or not properly set up, but that is just a wild guess from my side....
This way seem OK, although there are still a right way and a wrong way. Is your Nokia6233 class a subclass of the Nokia class ?
2) Does the center button give you a key code? What about the soft-buttons (the two just below the screen), do they return a key code? Those two are also used in the orbiter. Not sure if you can get by with that few buttons, though. I have 5 buttons more than the ones you marked out on the image, and this is just enough.
Do you have volume keys also, they might be usable also...