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Two things:
1 - the USB ports on these devices tend to be going the "wrong way" to use to attach a keyboard, but the iLiad has an undocumented bluetooth interface, and Scotty1024 was working on getting a bluetooth keyboard working. I don't know what state that project is in.
2 - If you don't mind a bit of a delay in how quickly your changes show up, the E Ink screen might actually work for you. There is inherent latency in the screen refresh, but if you will do somewhat more text input than actual editing, so that the editing process being a bit slower won't be a huge problem, this might not be an overwhelming problem. I say this only because you've pointed out that you have a serious problem with other display technologies, and a system that slows you down a little bit while editing but doesn't give you a migraine might still be your best option.
I'd suggest going to a Borders and trying a Sony unit. That's not probably the best unit for your purposes -- I don't think there's a way to get a keyboard hacked into it-- but you'll get an idea of the E Ink screen refresh rate that way.
Other than that, I'd suggest looking for an older laptop with a fully reflective b&w LCD screen that you can use with the backlight off. The Powerbook 170, for example, had an active matrix LCD screen that was quite readable in good light with the backlight turned off, at a wide angle.
If the One Laptop Per Child project decides to sell to the general public, that's another system that might work well for you.
Good luck -- I've had migraines, and they're no fun!
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