apm said:

Another idea would be to overclock the SE/30 and/or hack the video circuit, which conveniently is a bunch of discrete components. I think the amount of onboard VRAM might support 640x400 at 1 bit. But I haven't really thought that through yet. One hack at a time.

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It looks like the SE/30 has 64k of VRAM, which I assume it splits into two video pages? (Too lazy to look it up, but basing that assumption on how the previous compact macs offered two pages, a feature rarely used on the 128k model, of course.) If you could use it all for one page that's 524,288 potential B/W pixels. Best fit for that would probably be that 832x624 video mode that Apple used on their midsized monitors, at 519,168. A possibly intimidating thing about that is the pixel clock would be about three times higher for that resolution than stock, so even if there weren't some software-level deal killers (IE, compatibility issues from losing the second page, etc) the stock hardware would probably need some serious tweaking to go that fast.