Something I found interesting... if you Google for "TTL EGA LCD" you'll find that there actually are quite a few companies selling LCD panels with special controller boards designed to handle TTL input. They're "breathtakingly expensive" compared to VGA monitors of similar panel size (starting at around $400 or so for a 12") but oddly that's quite a lot cheaper than digital input CRT monitors cost back in the '80s, particularly when inflation is factored in.
Just another note, since it was unclear to me whether the original poster was asking about a monitor capable of handling a compact Mac's video output or the output from some sort of "dual page" monitor card: A digital-capable Multisync like an NEC Multisync/II/3D should handle the Mac motherboard video acceptably, as it's about the same scan-rate ballpark as EGA, but I dunno about a dual-page setup. Depending on the pixel resolution and whether it uses interlacing or not it might require too high a scan rate to work with those monitors. (3D topped out at IBM 8514A-compatible 1024x768 interlaced@44hz.) Of course, a dual-page monitor card might output an analog signal, in which case you might be able to use it with a higher-frequency VGA multisync with a cable adapter, so... knowing the specs of the original monitor would help you a *lot* here.
Just another note, since it was unclear to me whether the original poster was asking about a monitor capable of handling a compact Mac's video output or the output from some sort of "dual page" monitor card: A digital-capable Multisync like an NEC Multisync/II/3D should handle the Mac motherboard video acceptably, as it's about the same scan-rate ballpark as EGA, but I dunno about a dual-page setup. Depending on the pixel resolution and whether it uses interlacing or not it might require too high a scan rate to work with those monitors. (3D topped out at IBM 8514A-compatible 1024x768 interlaced@44hz.) Of course, a dual-page monitor card might output an analog signal, in which case you might be able to use it with a higher-frequency VGA multisync with a cable adapter, so... knowing the specs of the original monitor would help you a *lot* here.