I've been running Lion with the 64bit kernel using Chameleon for quite awhile.
Getting DP 2 installed has been a bit of a challenge, without a 32 bit kernel to boot the installer with. Have not found a way to boot the installer with Chameleon instead of EFI 64.
Tonight I found a way to do it. I downloaded the latest beta of VMWare Fusion. I installed Mountain Lion DP2 into a Virtual Machine. Then I downloaded and installed Carbon Copy Cloner in the VM. I then cloned the VM into a Disk Image (DMG). I then cloned the disk image onto a physical disk (becoming my Mountain Lion boot disk).
I now have a working, clean install of Mountain Lion DP 2 (64 bit kernel only) that boots using Chameleon r1820.
Follow the very long thread on Netkas.org for how to get up and running with Chameleon, if you don't already know. Don't screw around and try to wing it...you can end up with a big mess if you don't follow directions.
Not sure that qualifies for the 20 bucks, but lemme know....