How to reinstall Mountain Lion while disabling firewire extention

I am reinstalling Mountain Lion but get stuck at the reboot stage, because the installation procedure re-enables my fried FireWire port, which I had previously disabled by removing all FireWire-related extensions.  When FireWire is enabled (i.e. there are FireWire extensions in /System/Library/Extensions), my computer never starts up because it is busy printing a "handleunrecoverableerrorint" message about FireWire. 
How can I reinstall Mountain Lion while avoiding the re-installation of FireWire extensions?  I already have a bootable ML USB drive from which I am running ML Install.
My AppleCare is long over, but I've managed to squeeze a few extra years out of my 2008 MBP by removing FireWire kexts.
Here's what I've tried so far:
The problem seemed to be that /OS X Install Data/BaseSystem.dmg contains FireWire extensions, which I believe is the system that is loaded during installation.
I have already tried rolling my own identical BaseSystem.dmg minus its FireWire extensions (properly chmodded), but somehow I still get FireWire error messages during startup.  /OS X Install Data/kernelcache might be the culprit, but I don't know how to rebuild it.
I can't think of anything else to do... any ideas?

Open the Mac App Store, click Purchases, select ML, then re-download and install. However if your machine has the abillity to run Mavericks I'd just upgrade to that and bypass ML.

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    how to reinstall mountain lion from snow leopard after disc failure

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