Can't you just do an A Record like this :
* 86400 IN A xxx.xxx.xxx.xxx
to get everything pointing to your IP-Adress ?
I did some further research and it looks like the thing you want to achieve is impossible, http://serverfault.c...-to-be-a-cname/
This one may explain this a little more.
You could workaround this with a 302-redirect, making www.example.com redirect to example.com