Morgan, this would be a good time for us to convert this board over to cbfs, which removes a lot of the hackery that goes with a vga bios. It will require some help from your end -- people are for the most part overcommitted on these types of projects, and coreboot is no exception. If you're up for it we can give it a try. There are several of us who have made the change.
Let me know. This does, of course, mean you are now the both the participant and subject of an experiment, but I am hoping you don't mind :-)
thanks
ron