The tube doesn't care about timings and signal polarities, does it? I am literally asking, not challenging any statements anyone has made.

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Well there's increased voltages and a new sweep time which means that even if you get a stable image the voltage will be too low for you to properly see it. You can't just hang a larger tube in a compact mac and expect it to work. Most of the mods to run a larger screen basically took the video signal to the analog board and sent it somewhere else in a modified format, often enough it was composite. You will not get high resolutions if that is what you are after unless you use entirely new video circuitry.