I have the H67N customac build and the installer KPs if I leave any USB devices (other than the install device) plugged in.
If I unplug the keyboard after selecting the boot device, I can get to the installation screen. If I plug in any USB devices at the install screen, it KPs.
I used Tony's guide a while back and remember using an alternate boot iso to successfully install OS X (iBoot doesn't work for me)- I can't find where I saw that mentioned. Does anyone know the name of it?