I have updated iatkos 10.5.5 to 10.5.6 without any troubles, on my setup it had the disabler installed by default, though I was running the vanilla kernel.
If you are using a custom kext for the storage controller where your leopard partition is make sure its not overwritten by the update (keep a working copy or put it in /Extra/Extensions.
Also instead of keeping the old 9.2.0 you can try installing Voodoo kernel 9.5.0, just do it before rebooting after applying the update.