A lot of laptops can do the switch via software. What you could do is get windows loaded up on it, see what the steps are to change the vid over, and have a little startup script do it for you. Or possibly write a script that replicates the function-F4 keypress, but this may or may not work depending on what level of the PC is doing the controlling.
The hardware route will probably be a lot harder to do. One thing you might look into is modifying the bios. Depending on the bios manufacturer, there are a lot of tools out there to help. The other factors that might come into play is if the video bios is separate from the motherboard bios.