I'm sure that Compaq's Smart Start Scripting is also available (although unsupported) for DOS.
This could then be put in as one of the provisioning steps.
BTW: Team bonding that uses split switch port technology is called SMLT, DSMLT or RSMLT. You may want to look at or contact the switch vendor about PXE failing due to bonding they may have some howtos.
1) Unplug one port during PXE install.
2) ask cstmr if they team bond a NIC with dos. If so you will need to create you own .img file that bonds nic at the very beginning.
3) BIOS modification: 2 issues here:
a) does HW vendor have tool to save bios or configure bios with same bios image accross servers? A floppy bootup disk that does this kind of stuff? key is boot disk /cd not a tool that needs a full OS to work. Then work that tool into specialized BL .img file.
BUT depending on when PXE is failing you may not be able to do this at all.
b) You will need to set turn back on nic/ or pci slot once OS is installed. Now I would think you could use a OS tool that modifies bios and use a BL config package.
Just thoughts not sure of the variability yet! I do plan to investigate above mysellf later in the year.