Script before WDS image selection

When booting to the Windows Deployment Services setup that lets you
select from your various install images (the screen is a Vista setup
screen), is there a way to run a batch script AFTER this is run?

I'm deploying Windows XP and I want to copy a customized Winbom.ini file
to the hard drive before the machine boots into the Sysprep factory
mode. Essentially, I want the technician to select a Winbom.ini file
from the WDS boot menu, go through the process of installing the single
XP image for that HAL type, then finally copy the Winbom.ini to the root
of the system drive before the machine reboots.

I do NOT want to create MULTIPLE install images just for different
Winbom.ini files. I would rather create multiple boot images, or find
some other way that script the selection of Winbom.ini, while still
using WDS setup.

(I can use WinPE and do it manually, but I'm trying to automate this for
my coworkers. I could also write an HTA to select Winbom.ini, but then
I'm using WinPE, not WDS setup.)

--
David
Stardate 8443.5