The simpler workaround is to use the Chameleon bootloader to turn your Mac into what is essentially a Hackintosh. This allows you to boot the 64-bit kernel via

The simpler workaround is to use the Chameleon bootloader to turn your Mac into what is essentially a Hackintosh. This allows you to boot the 64-bit kernel via the BIOS emulator, bypassing EFI32 entirely. Catch is it requires two internal drives and a supported graphics card to get it to boot, and the GMA950/X3100 has been cut. This means it's the unavoidable end of the line for MacBooks, iMacs and Mac Minis cut off by this update. It would require someone to write a 64 bit graphics driver/kext which is well beyond the scope of the hobbyist world. However for us few Mac Pro 1,1/1'2 owners, this means our machines can keep on chugging. EFI is solvable limitation. No support for your GPU isn't. Problem with your solution is any machine old enough to be cut off by this would be pretty crippled by the overhead of running two operating systems at the same time.