Well, as above, if it's no more than a regular LCD that can upscale a 15kHz signal it'll look like ass. Even if it's 4:3. Think of a 640x480 signal going to a modern LCD - it looks shocking. I have a 15kHz capable Dell panel, which will do 480i, keeping the flicker. A 320x240 signal *might* be slightly better, but i haven't bothered trying as the picture is awful as it stands.
The panels would need good upscaling features to look any good, and i don't see that being cheap, and thus i can't imagine they have any. This is what external scalers do well.
That said, can you post a link to the panels you're talking about? They might have some ability to deal with the higher voltages put out by a jamma board as well.