Which basically have you setup a DOS bootable CF card, with an Intel utility and an autoexec files that executes the Intel utility to write a MAC address to each of the NIC's. This written address will stick, even after the device looses power.
However, the only useful router I was able to install was DD-WRT. And unfortunately had problems differentiating between the LAN and WAN ports in the config. I'm sure someone can do it, but this is where I'm giving up.