why the heck? efi is used for bootloader, boot.plist and hardware specific kexts to reside only. mach_kernel is to be kept on SL partition.
the only thing to do to have fully working 10.6.2 is update to it and then REPLACE the original mach_kernel with the patched one before system restart. DONE.
NSCXP2005, now there's NO WAY to be 100% Vanilla with Atom under 10.6.2 (you are, actually. but till the next SU (10.6.3 . what tea's done is the ONLY WAY for now to run 10.6.2 with Atom
BTW, seems tea owns NC10. so the best way for you is to follow his blog news (see first post for links)
That's right, my mistake. Basically, you update your OS to 10.6.2, then you download the patched kernel, put it at the root of your partition, and in the boot plist, you add the entry "kernel" and the value is the name of the patched version.
Beland is absolutely right, 10.6.2 won't be Vanilla on our Atoms anyway. But I can see the "philosophical/psychological" value of running Vanilla.