The B&W analog board only supports a TTL video input and I admit I don't really understand how the video amp works, but being that the CRT itself is analog and so is most of the circuitry in the video amp circuits...

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Not sure where you got that idea, but it's not correct. The video amp is a binary video amplifier, not an analog one. If you try to run the video amp with non-digital signals, it will cook. The video amp is set to work with binary signals, and so it dissipates little with either black or white (the transistor is either full on -- low V -- or full off -- low I -- so it's never dissipating much power). But ask it to amplify an analog signal in between black and white, and the video amplifier will rapidly self-destruct. That's why the grayscale mod for the SE/30, for example, requires an entirely new video amplifier. So, you've got a little more work to do.