It appears that the Golden Wii Wheel is still available on the EU Club Nintendo, despite not being listed in the Stars Catalogue. I don't know whether I should hold out for the golden Nunchuk, in case it makes an appearance, or go for this.
e: How do I get games to appear in the Stars Bonus section?
There aren't any games there because there aren't any releases from Nintendo coming in the next few weeks or so. You just have to wait until a new game is about to be released and when they start to put out adverts and the hype surrounding it increases, which is generally about a couple of weeks before the release. I personally don't bother though, because it's only 50 stars and judging by the appalling prices of our tat, it'll hardly make a difference to anyone's balance. (Unless you want to buy a cheap wallpaper that ends up looking absolutely terrible on your desktop anyway -_-)
Also with your Wii wheel/Nunchuck dilemma, I'd hold out for the Nunchuck. I think the Wii wheel might have a little bit more market value than the Nunchuck (as far as I know it's only on the EU Club Nintendo - might be wrong about this though) but it's a fairly useless add-on which looks a little tacky next to the golden Wii remote and Nunchuck anyway. I don't know about you but it gets in the way a lot when I play Mario Kart Wii with it.